Quote:For me IBIS will be a reason not to buy the camera. And I know I might be wrong, but with two Pentax cameras I always had focus problems. Or expected more sharpness than they actually could deliver. I know, stabilisation can be a help when having no tripod at hand, but I also experienced failing of these techniques and have enough lenses without VR. Then I am sure nothing moves in a way I can not foresee.
Pentax is notorious for their slow unreliable AF, especially in older models (K10, K20, K5). I "vouch" for them. It has nothing to do with IBIS but everything to do with their AF module.
Olympus has IBIS in all their cameras and the sharpness is absolutely exemplary. The only thing than can potentially affect sharpness is shutter shock on certain models (the E-M1 is particularly bad in this respect).
Check Robin Wong's work if you have doubht about the sharpness you can get from Olympus gear: