If you ask me, they look pretty much the same as the smaller versions, but I guess big is better right?
There seems to be different weapons accessories available for these bigger figures however, and the detail should probably be a bit better on larger-scale figures generally.
And if you aren't interested in World Box's MK9 figures, then here's the latest MKX versions, though I wouldn't think they are in the same league in terms of quality.
Only these 2 characters announced so far for the 12-inch scale. Let's see if they do more..
Purchase Mezco Toyz' Mortal Kombat figures from Entertainment Earth