from my experiances the k10 1.0 and the k11 1.0 there is no diffrence whatsoever, to be honest a k10 1.0 high comp would beat a k11 1.0
ive drove a standard 1.2 k10 but not yet drove a k11 1.3, remember the k11 is heavier than the k10, there probable aint much in them to be honest and i wouldnt be surprised at a tuned up k10 like marks beating a tuned up k11, the k10 is going to have quite a bit more low down torque than the k11 due to the fact it being a 8 valve also the power to weight will be better.
to be quite honest though if you want a fast car buy one in the first place, k10's and k11's arent fast imo, thats with the standard engine's, im not going any further than dropping in a ma12 in mine, tuning that engine would be a waster of time considering all the money i would have to spend on it, it would be more benificial saving up my money and put a diffrent lump in there that responds well to tuning ie a turbo lump like a ca18det or a sr20det.
i do take my hat of to thoes that have squeezed every extra BHP out of there little MA's and CG's