Just picking up this thread again to report that three days ago I dropped my 85mm 1.8 G on to a carpet covered floor, from a height of about 1 m. This was such a "soft" drop that I thought nothing more of it, and just put it away.
The next day I took it out and at first couldn't understand why the viewfinder was so dark....and sure enough the diaphragm was dead stuck.
Takeaway: the "plasticky" feeling you get when you handle this lens is, well, because it is. Optically it's superb, but if you anticipate using it in rough conditions, a 1.4 might be worth the price.