Hi!
I am posting two renders of the same scene here, done with two different renderers: One with Blender, one with Yafray.
Please vote on which image you think has been rendered in Yafray. The resolution of this quiz will follow shortly 
IMAGE 1:
IMAGE 2:
If you vote, please state the reasons why you think the image has been rendered in that renderer.
Thanks!
I voted for image #1 as being the yafray render because the reflections are substantially sharper. Yes? No?
Just a guess.
3ASY!!!
1mag3 1 = B13nd3r
1mag3 2 = YAFRAY
#1 is Yafray. I suppose %|
There is the seam of the envmap visible in #2 (left king).
Anyway, astonishing.
it is not exactly the same picture but:
image 1 : blender,
image 2 : yafray, better reflection, better AA
yeah, im with richie, the 2nd is yafray. theres just little bits that say so. i think i can see some background being reflected in the kings, and you can sortaā¦ i dunno. but thats what i think.
Hmmmā¦ I know you said they were rendered in different renderers but I think theyāre actually both Blender renders - or at least both could have been rendered in Blenderā¦
The main differences are:
a) the sharpness of the reflectins - which could be varied by means of the filter value in Blender
b) the sharpness and ādarknessā of the shadow cast by the left King
c) the edges of the āroomā.
d) the reflection angles
What makes me think both are Blender renders though is the left King in both images.
In Image no 1: The purple patches on the bottom ring donāt make sense to me! At this angle I would expect to see a black line on the rim reflecting the black square underneath. Those 3 purple rectangles look wrong! (same with right king)
In image no 2: as tordat pointed out, there appears to be a seam showing implying an environment map.
Hope youāre not going to keep us in suspense for longā¦
Question: what if you did use Yafray in one but used environment maps as textures in that file tooā¦ 
ps. If that āseamā is actually a reflection of the room corner then its not a texture map problem - in which case Image 2 is the yafray render.
ilac: hehe, no, I didnāt do anything to let one render look as if it was rendered in the other renderer, or anything like that.
I will answer all questions as soon as the āsolutionā is posted, because if I answer now, i will bias the audience
P.S.: This is the layout of the scene (the camera is highlighted) :
iād say the 2nd is blender. looks at the shadow
But the reflections of the floor on the kings in the Image 1 is all wrong. Image 1 could not have been done in a raytracer imo [!]
For some reason Image 2 doesnāt convince me as a raytraceed image either though! :-?
Mah, gotta go to sleep now. Guess Iāll fnd out the answer when I wake up! 
ps. Either way nice render Intrr - whichever is (are!) the Blender renderās! 
My first thought was that image 2 is the yafray render, but not Iām not sure what to think.
Image 2 is Yafray. Yafray tends to have a sharper spec. The top one is Blender.
im just stoked with how realistic blenders renders are beginning to look 8)
Image 2 is Yafray. It has reflections of reflectionsā¦ ???
%<
both are blender, but then again, its fully possible to create a (crappy)not-convincing render in yafray tooā¦ like not having a hemi-light on purpose, but Iād still bet that both are blenderā¦
What makes it hard to judge is the fact that the things that yafray will do better, and the things that blender cant do, isnāt being done in what could be or not be a yafray render, like bouncy colors, which is obsolete due to all of the surfaces being reflective surfaces, and the gi-shading which was left out because of obvious reasons that the yafray render would be detected at start, and the bad jpeg compression makes it hard to judge aswellā¦
its either, two crappy yafray renders, one crappy yafray and one blender-render pushed to the limit, or two different blender renders pushed to the limitā¦
I really havent done any work in Yafray, but from what I see image#1 has fine tones and sharper edges than the bottom one to me. also the shadow on the king on the left sure is quite questionable. lastly, the reflections on image#2 dont seem to be as well developed as image#1. SO i conclude that from all the time that IVe used blender, i have never seen such great render. I Believe Image #1 was done in Yafray
The thread is really more amusing that iād ever have thought
Eldron: Why the hostility towards Blender? And no, itās not like both images were rendered in Blender.
And about all this āGIā crapā¦ it seems that people need buzzwords to make themselves sound more important. I donāt know, but I donāt have hemispheres with little lamps attached to them in every room in the house, so why does every image suddenly simply HAVE to have āGI Spheresā, and if not, itās a crappy render?
People, stop following clishees, and start THINKING again
And start LOOKING at the real world around you, and tell me how many GI spheres you see, and how many unsharp shadows (and itās not like Blender couldnāt do them, itās just that most people donāt know how, but thatās fine, they can use Yafray:)
When I look around in the room here, in fact MOST shadows I see are sharp.
But the resolution will follow in a few hours, and holds a few surprises
image 1 canāt be yafray, reflection is all wrong.
image 2 looks like a crappy yafray pic, with strange defaults. so it could be blender too.
image 1 : blender
image2 : yafray
Interesting! The votes for Image 1 = the votes for image 2!
It would be a really big surprise if Image 1 was rendered in Yafray because of tyhe faulty reflections. But then Iāve never used yafrayā¦
To those that complain the āreflectionsā in Blender are not sharp enough - increase the map resolution and lower the filter setting from the default setting of 1. Filter 0.1 is the sharpest. In the real world a reflection is actually never as sharp because nothing is 100 % reflective in practice.
nb. The filter setting is also available in the Image texture setting - so if images in your renders look more blurred than when you see the texture out of Blender, you have to lower the filter setting. Iām sure many newbies miss this partiular setting! It had taken me a while to realise 1 was not the lowest ( afew years agoā¦ !