"Just because MINE has no problem means there is NOT a problem." That is what is called a "canard".
I did own a 50mm 1.8 EF-II. It
flared really badly when shot toward the sun. It ghosted a big, huge
green ghost across most of the frame when shot at glancing angles toward the sun. It
focused very poorly indoors, and often would
hunt back-and-forth,back-and-forth, back-and-forth very noisily, and would allow lots of great shot opportunities to go by, due to being unable to focus. I tested it against a Nikon 50mm Series E, a 1982 or '83 model I got for $30 from a pawn shop, and the Series E was more flare-resistant, but it too was inferior to other 50's I owned, so I traded that off. I owned my 50/1.8EF-II for about three months one summer, and then in the fall my wife's nephew went to Seattle to study photography, and a requirement was that ALL students have a 50mm lens, so I gave him mine, with the admonition that, "This lens is a piece of chit when shot toward the light, so be aware of that."
As far as failure rates....take a look at Lensrentals.com's January-July, 2012 freqwuent failures. You will see multiple items which tend to break down frequently, out of a pool of typically 60-100 lenses of each model. Please note: just because somebody has a working ___________, does NOT mean that ALL units of that item are therefore good...that is called, "a canard"....a fancy name for a lie...
LensRentals.com - Lensrentals Repair Data: January ? July 2012
Oh, and BTW....Lensrentals.com will NOT rent the Canon 50/1.8....imagine that!!!! Why? Well, one policy Lensrentals.com has adopted is that
when an item breaks down frequently, or early, they will NOT rent it....it's not worth the hassle,for anybody concerned. Besides, who would rent a cheap,plastic lens that has earned a reputation for horrible bokeh, bad flare resistance, ghosting, noisy focus, slow focusing, unreliable focusing, a skinny hard-to-reach focusing ring, and overall econo-box build quality????
Individual users who say, "My D800 is great! There is NO PROBLEM!" are about 80 percent of owners...somewhere between 14 and 20 percent of D800's seem to have been delivered with left-side AF problems. I have seen a good number of D800 owners on-line trying to convince others that because
they have no problems, that the quality of
ALL D800 units is "perfect". MY PERSONAL Canon 50/1.8 EF-II lens was a cheap, flarey, ghost-prone, slow-focusing, noisy-focusing economy 50mm lens with hashy bokeh...it was,simply put,
one of the chittiest 50's I have ever owned when shot indoors, or toward the light. What is the point again? Trying to prove that tens of thousands of owners who have had their 50/1.8 EF-II lenses snap into two pieces are somehow lying? Again...one man who has had luck is trying to persuade others that because HE has had no problems, that therefore ALL examples of this specific product are "good". Nice try, but no sale.
AGAIN....watch the video....the lens is pop-riveted together with plastic rivets...