A lot of Cup owners (me included) dump the stock seats and stick in buckets anyway, as they are as you say cr*p!
The Cup no matter what people say is the better handling car but this is only going to be really apparent depending on how/where you drive, after all thats what the Cup was designed for.
The ABS argument can go on and on, ten or so years ago ABS was a luxury, theres as many accidents now as there were then, I have only had ABS kick in on me twice and that wasn't through driver error on my part, but I admit that the first time it saved my life (when some a*sehole decided to cut me up when I was doing 90 and he was doing about 60!).
And someone with ABS can still end up being cut out of a car as many fast cars with ABS lose it all the time.
It really depends what your used to, I am old enough not to have had many cars with ABS and I have lived through it, if you take chances and drive recklessly in any car ABS or not you may not live to regret it.
And even F1 drivers crash its just whether you see ABS as a must on your car or not, we all take risks everytime we step out of the door.
I like both the full fat and the Cup and have driven both and prefer the Cup, if interior looks and driver aids are what floats your boat then the full fat is for you, In an ideal world I would have a Cup for weekends and a full fat to get me around in the week, but we don't live in an ideal world unfortunetly!