I tried 17-55 ef-s in shop several times in 5k WS
and I noticed they are not the same in vinetting
cause some of them were vinetted heavily and some of them was very small vinette
this morning I tried my cheapo old 18-55 ef-s bundle lens, and with surprise
there was very small vinette to use it in real world!
so I will visit many shops to find 17-55 ef-s 2.8 with small vinette
and also 15-85