So I would not call it a mistake :)
heh.. yes and no. before I used it .. you never know, right? it is my fave! before that for years 50mm 1.4 was my fave. recently I enlarged my arsenal, and finally have got the top wide angle 16-35mm and a manual soviet 16mm fish-eye, all of them in a way are my faves. BUT, getting 150mm macro still was slightly a wrong decision - now having it I cant plan to change to smth else. actually: the minus is its too heavy, more tripod-intended, and the long 150mm focus means I cant do short timings from hands.. well, I do but anything less then 1/125 can be very questionable, for macro that is always a problem. so all in all thats a great lense, I am a fan of using it for street photos and doing paparazzi job, it has a pleasurable bokeh and light-power, the 'pro's are obvious. but still it has some 'contras' too. thats all for me today. no more !BEER left probably - time to go sleep :P
thanks for conversation, and acquaintance! laters.