Yeah the sense animation is old hat to me - no real animation when you open the app - and a fade out animation when you exit the app. I really like stock ICS animations.
Yeah don't know why they left it out - just like HTC and Samsung left out the crt animation.
quick comparison screen wise - the colours are a touch more saturated on the S2; when comparing a high res nature pic side by side, both at full brightness (which is about the same on both btw), they look very similar, HOS fits a bit more of the picture in due to a higher res but because of the pentile effect - it doesn't look any sharper than the S2 and in some pics the S2 looks sharper. I can really notice the Pentile effect too - much more than on the S3.
I prefer the S2 screen tbh - also the icons are a little bigger on my screen dpi wise which I prefer on my homescreen layout and app drawer - my icons in the dock are bigger and look better to me - haven't got time to go into detail at the mo but I'll have the phone till the end of Monday so will give more feedback from now till then.