The GT63 is a great looking car, but as soon as it gets put next to the M8, Panamera, or even RS7, to me it just starts to look like a blob with no real definition or personality. The M8 is definitely the most striking, but also the most polarizing in its design. Porsche is the 'safe' bet as usual.
M6 Gran Coupe for me, although the M8 is a close second!
Now if only I could afford any of the above....