Might just be my train of thought, but I see a pecking order when I think of groups of Japanese cars.
Supras, Skylines, Evos, Imprezas.
There are 4 very known Japanese cars.
To me - keep with me here I'm speaking in a roughly general way, not down to a T with my comparisons - the Evo and Impreza are about on a par. They are the rally cars for the road, very quick, reasonably square/boxy looks and are good fun.
Following that you have the Supras and Skylines. They are the big grand tourers. They have more presence, nicer lines, more luxuries and the ability to spank those "lesser" cars with relative ease and lack of effort in doing so.
To be above the Impreza and Evo, they need to be quick. An NA Supra is not enough to do so.
I know it's a silly way of thinking about it, but I do feel that in terms of a "pecking order" that the Supra and Skyline are right at the top and to command that position they need that power aswell.
The NAs are great cars by all means, but, personally, when I think of a Supra, I think FAST. To me, the NA isn't that anymore. Depends what you're being relative to of course, but when EK9 Civics, DC2 Integras, VXR Astras etc. etc. will all go by them, that's not enough.
Obviously aswell it depends what you want from the car and what you see it as.
This is my view - and may be mine only - and it makes me so happy that I chose to have a TT (well, NA-TT).
I'd sooner have gotten bored of a facelift 6spd SZ-R (NA) than the 5spd non facelift SZ-TT