For those of you, who like benchmarks, this might be interesting.
I was asked by Phase One support to do a screen recording when panning around and doing brush strokes at 100% view.
I did the exact same thing within Aperture and uploaded the video to YouTube. Machine specs are in the video.
You may understand, why I still stick with Aperture for sorting, rating and comparing images and lite editing for now. It is simply far more efficient.