yes

There is no custom roms for G version YET, but there's high chances of them being rolled out in near future since the non G variant contributes to a significant sales volume, considering some asian countries are getting it too.

Apart from the availability of custom roms, there's no practical limitation, everything is just the same.
I won't even go to the cpu and gpu comparison part. For me it's BS, no offence.
Once again, just get it or you might wanna wait for other super phones that will be made available in couple months of time. But whether non G or G, SGS2 is still an amazing phone and i really can't stress this enough.

Ohh..please dude, spare us. Whine somewhere else, would you :-P

---

Added on October 9, 2011, 9:05 pm

Samsung release its flagship phone once a year and that is SGS series. In between more Galaxy family will be release. LTE and LTE HD had been released already for Korean market. Galaxy Note will be coming soon. I think by this year also though when it will arrive at M'sia only time will tell :-)