You only have to look at the 1 series advert for the new shape that aired about a year ago. 2 brothers that were the biggest bell-ends going. For anyone thinking about a 1 series but were wondering about image then that advert would have put most right off. A pair of "on a budget" hooray Henrys with an unjustified superiority complex.
That is the epitome of most 1 series buyers, pretending to be posh/rich/successful on Golf money. My ex neighbours had one - fur coat and no knickers, they didn't have a stick of furniture in the house and watched a 17" tv sat on beanbags in the living room, all so they could drive a 116i and pretend they were well-to-do, when in reality they were a pair of rarfys.
Anyway, comparing 135i to a GTI is ridiculous, GTI is a great allrounder, a highly practical car with performance. The BMW excels in 1 thing (performance that you won't get to fully use off a track) and fails everything else (looks, practicality, standard equipment, exceptional economy relative to it's output etc).
Coming onto a GTI site just to try and put down the GTI - have you nothing better to do?