That looks absolutely amazing, non-M or otherwise. They've tuned out almost all of the 2-series odd proportions. The rear quarter-panel area is a massive improvement to the profile, and eliminates the last of the "squashed BMW" look of the E82 and F22.
I think the rear can be meaningfully improved by making the lower diffuser area surrounding the exhaust tips less flush with the bumper. That should curve inwards, a la E46 M, which will make the bumper feel less tall and square. Oddly, they executed this much better on the base model.
No idea why anyone would buy a Supra when this exists.
