how does it compare to... nothing...

i hate it to compare devices with different circumstances. like you would compare a mac with a wintel pc.

e.g. sgs2, its using android. android is very ressource hungry (had the lg optimus 2x, and it was laggy while swyping in the main menu, absolute no go!), so its good that the g2 has a dualcore, lots of memory aso.
or the iphone 4 with (only) single core soc, but very smooth ui.
ours will be at least as good as ios (imho) regarding smooth ui and apps (120fps has been mentioned in this thread )

but atm we dont know more except of what we already know, means no details for the used hardware.

but i am pretty sure that our device would loose a direct compare to the sgs2 (regarding soc, memory aso), but we wont need so much power to run everything smooth. thats the point.