The processor in that doesn't quite match up to the Exynos but it closes the gap a little bit by being clocked higher. Plus, bigger screen and NFC, so I say go for it.
Anyway I just performed complex fucking surgery on my SGS2. The EFS files got corrupted at some point earlier today, been trawling XDA for hours for a fix and finally managed to sort it. Basically if your EFS files get corrupted it won't even recognise that there's a SIM in the device.
Shit was touch and go for a while, if you can't restore EFS files from a backup you can literally only fix it by sending it back to Samsung. I tried wiping the ROM before I found the fix, so now I gotta restore my apps and data, but so relieved.