I test drove my mates M135i last weekend and had a little play with him against my MK6 Revo Stage 2 GTi.
The BMW is effortlessly fast and mullered me off the line with its rwd and auto box, but once rolling there was nothing between the cars performance wise.
If you love your GTi's a cheeky remap on the new MK7 and you'll be knocking on the door of 300bhp easily, best of both worlds.
Was a bit of a last hurrah for our GTi mind as we went and bought a new 120d M-Sport, test drove the 125d which is a twin scroll single turbo (not a twin turbo like the old 123d) and didn't feel the additional performance over the 120d justified the cost, agree with earlier comment that it just doesn't feel 210ish bhp fast.
Had looked at the GTD a few weeks previously and just felt it looked too similar to our current MK6 so gone for something different this time.