jmonzani

<p>From an optical point of view and from my tests (portraits), the 50mm f1.4 is very similar to the f1.8, with better control over flare and better bokeh.<br>

At first sight, the built quality of the f1.4 is obviously better but I've got to say that I'm part of the several people who had AF problems with it. Basically, AF stops working. My copy went dead three times and was repaired twice. I was really disapointed when AF stuck for the third time and didn't touch the lens for some monthes. I then happen to use it with manual control and AF all of a sudden started to work again.<br>

Unfortunately, this isn't realiable, that's why I always carry the f1.8 as well as a backup.<br>

My reason for buying the f1.4 (and I was already owning the f1.8) was that I'm using the 50mm focal lens a lot and I thought it would be a great investment to go for something better built. It turned out to be the *worst* investment of my lens collection. None of my 85mm f1.8, 35mm f2, 24mm f2.8 never ever had AF problems or went to service.<br>

That's why I now advice people to rather go for the cheap 50mm f1.8 instead.</p>

<p>I love the 85mm f1.8 as well and used it on film bodies before buying my 5D. I both own the 50mm f1.8 and f1.4, they produce similar images, even if the bokeh of the f1.4 is better and its construction too. But I would hardly recommend the f1.4: <b>mine had problems with its AF motor several times</b> and I'm not the only person to say this. It seems that you should be very very careful with it. Especially, never put the lens upside down when you stock it.</p>

<p>I've got to say I'm very careful with my gear, and while none of the 85mm f1.8, 35mm f2 (great lens by the way) never had problems, I've already sent the 50mm f1.4 <b>twice for reparation</b> which cost me each time more than the price of the 50mm f1.8! As time goes by, the AF of the 50mm f1.4 tends to get slower and slower and grip. I've read several posts on forums with people having the same complain...</p>