ok i voted no, not because i have a 105, but because, what main differences are there apart from big engine#? and if thats not your thing a 105 is fine! (ok i want a 120! so badly! insurance is just too much!!)
The only difference other than the engine is the brakes, clutch, gearbox and a few other minor items.
If you are on about build quality of the interior/exterior then they are all built on the same production line by the same people with the same materials so there is bugger all difference. It is like any mass produced car, there will be good ones and bad ones