Just looking at hands over videos with the t mobile gs2 which runs on the same hardware and I can notice its pretty bad. This is comparing to the epic touch 4g ( exynos powered gs2 ) which is just ridiculously smooth. I mean if you can see the thing lag on videos, it usually means its stutters more in person. If you take your finger and swipe the screen on the web browers, I saw the thing lag pretty bad and the pinch to zoom is not as smooth. It looks as laggy as a EVO 3D.
I have a lot of experience with the OG GS2, so I know how smooth it is suppose to be. Have any of you guys use the OG GS2? Smooth is a very relative thing. A lot of people thinks the EVO 3D was smooth until you put it side by side with something much smoother, I mean hell, the OG droid felt smooth compared to the blackberry storm but that thing is lag city by today's standards. My phone was considered super smooth until I put it side by side to a exynos powered GS2. Now my phone is so laggy by comparison that I can't stand it anymore. Meanwhile I would show my phone to the HTC thunderbolt owners and they blown away by how fast and smooth my phone is compared to their phone.
To put things into perspective, the galaxy nexus is suppose to be super smooth with the hardware acceleration with ICS. Most reviewers would say yes the phone is quick, but some phones still felt quicker. One of those phones would be the exynos powered GS2.