I've been collecting Canon L series lenses for around the last 10 years. No doubt they are of great optical quality. However as someone who trained in broadcast TV I'm used to manually controlling Iris on the barrel of the lens and with an L Series lens this is simply not an option. This was less of an issue on my DSLRs but I'm moving away from shooting DSLR video to predominantly working on my FS100. I hear many people talking about their investment in canon glass and this is determining camera format decisions in the future and I'm not convinced this is the best approach.
Investing in glass - It's an important decision
Since I bought my FS100 last year this lack of iris ring on my Canon glass has caused me much frustration. I did toy with the Biger adaptor and even the MTF but the Birger has yet to emerge and the MTF is a little bulky for my liking. There is of course a new contender in the form or the Metabones powered adaptor My buddy James Tonkin just had his delivered and I had a good look at it. It is very well made so a great option for those wanting to use image stabalised lenses.
But back to why I'm going to sell my L series and buy Zeiss instead.
(I will be hanging on to my 70-200 L series IS as this is a lens I just can't do without, and my 45mm TS - hence a metabones is on my shopping list)
But I recenlty bought an 85mm f1.4 Zeiss contax and it's stunning.
Then I did a shoot with Robin Schmidt and he has a set of Zeiss Contax and I really enjoyed using them. It's like having a set of cinema lenses and working to a fixed focal length discipline is very enjoyable because you work within set parameters of field of view.
The shoot I was DP'ing for Robin was part of a Luxury travel brand he's been working for resorts in the Maldives and Maurituis. But sadly for me this shoot was in London.
Afterwards we shot a silly parody but you can get a feel for the lenses
Please note this is just a bit of fun, it was shot in an hour and cut very quickly so it's not perfect...