Where do you start the differences are enormous the similarities are few. you cannot quote figures to compare.
The inside feels like your living room big , spacious and safe but very confidence inspiring.
The gear shift short and slick plus an extra gear. The noise under hard revs is like Eartha Kitt purring in your ear (yes I'm old)
The sense of speed is poor 120 = 50 in the gta, no wind noise , no tyre noise no little jitters no lightness about the nose. The suspension is sublime.
But I took it back, settled into the GTA and knew exactly which car I preferred and tomorrow she gets a good clean even if she is a little edgy.