Generally, 2500K at 3.3 Ghz is about 50% faster than 1100T 3.3Ghz in applications using 4 cores or less, and about equal when using all cores. Additionally, if you overclock, 2500K generally gets to 4.4ghz easily, whereas 1100T gets to about 3.8~3.9ghz, in which case 2500K is 75% faster using 4 cores, and 15% faster using more than that.
So bottom line is 2500K all the way, not just gaming, but also in other tasks as well (and in power consumption too).
With that said, 8 core AMD cpus' do offer better future usage outlook, even for games, since more and more applications are using more threads. 2500K is still better than 8 core AMD now for gaming, but it may change in the next few years. We will have to wait and see.