This is not a laboratory test review. Purely my own opinion based on my personal experience and my knowledge regarding the lens.
This absolutely one of the many very great lens that I have ever tried. So great that I decided to spend a great deal of cut from my saving to own one after considering this lens has been a favourite lens for many great photographers. Its a mainly portrait lens for many but I did many full body shoot with it on a more spacey places.
1. Very nice round and not-so buttery bokeh and great ability to blur the background beautifully. You can hide a lot of composition flaws with the blurs created by this lens…No! I am not being sarcastic, the lens has done me a lot of favor with bokeh resulted.
2. Great build. The lens got a bulky tough look and the body when handled feels very decent. This lens will make you looked pretty cool especially with the hood on. Oh and I need to mention that the hood is big enough for some cool stickers to make you look cooler and maybe mocking some competitors. Cheesy
3. Sharp. Deadly complementary with the bokeh. Good and enough crispness.
4. Fast autofocus locking and relatively reliable in accuracy, though occasional slight miss focus with my 3 years old Canon EOS 60D.
5. As far as i know, this is the 2nd cheapest L lens from Canon after great 17-40mm. So compare to any other L lens this lens is relatively cheaper
6. Due to the popularity (well at least here) The lens is quite easy to be sold and there are many available used items on the market
1. Not a very versatile lens especially by combining it to APS-C sensor cameras. You really don’t want to stuck with this lens in a very tight space unless you want to shoot really really close. This is then solely my only reason why I use 50 f/1.2 more.
2. Very heavy. Almost one kilos of extra baggage will put you into dillemas between brought the lens with you or prepare extra space for mementos to bring home for your mother-in-law. Its gonna be a tough decision.