My preferred main lens is a fast 35, combined with an ultra wide angle like 14 or 15mm I'm pretty much covered for 80% of my shots when travelling.
The Nikkor 50/1.2 used to be an inseparable companion but that changed when I fell head over heels in love with the Nikkor 35/1.4G when borrowing Bjørn's copy during a "one lens day" challenge in Lofoten, 4 years ago. When I jumped ship to Sony the Nikkor was replaced by the Voigtlander 35/1.2 Nokton II, a monster in Leica M terms but half the size of the Nikkor though the all metal Voigtlander was almost as heavy.
The VM35 won me over with its unique dreamy character, amazing boke, sharpness, metal built, aperture ring, etc but it wasn't the main lens I was looking for as it's look is not the kind of look I wanted all the time plus I wanted auto focus for my main lens. So when Sony announced the Sony Zeiss 35mm f/1.4 FE - the only current 35mm f/1.4 lens with autofocus, metal built and aperture ring - I was getting excited only to be in absolute shock about its size when seeing the lens for the first time at the Photokina, this thing is a true monster and quickly got the label of being the first autofocus Otus lens by some early reviewers as Zeiss apparently used the same "bigger is better for maximum IQ" design philosophy.
In the meantime several lenses in the 35-45mm range somehow made it's way to the camera bag, but they will soon go up for sale to make room for the newest kid on the block. Before I do so a size comparison shot was in order, from left to right the Sony Zeiss 35/2.8 FE, Voigtlander 35/1.2, Sony Zeiss 35/1.4 FE, Leica Summicron-C 2/40 and the Carl Zeiss 2/45 Planar in Contax G mount. All lenses are fitted with the appropriate adapters and Sony E rear lens caps to make it a fair comparison.
A7s with Voigtlander 125/2.5 APO EFWhen using the 35/1.4 FE in Slovenia I discovered quickly that it was the main lens I was looking for, the IQ is superb, razor sharp wide-open, the Zeiss colours and pop are all there and the boke is super smooth. The all metal built is very solid and the focus ring is butter smooth. The aperture ring is on a level I never experienced before in any lens, its smooth and has solid 1/3rd clicks with an extra resistance and longer click for the auto aperture setting. The aperture clicks can be disengaged with a switch on the lens barrel for click less aperture changes during filming, very clever and simple to use feature.
In short why the other lenses can go:
Zeiss 35/2.8 FE
+ Razor sharp wide open, bold Zeiss colours and punch, small
- Aperture is too slow for my type of use, simply not enough DOF control
Leica Summicron-C 2/40
+ Really small, all metal build, smooth focus, sharp, its a Leica
- Too much coma when used in low light
Carl Zeiss 2/45 Planar Contax G:
+ Razor sharp wide open, bold Zeiss colours and punch, small
- No focus ring and focus with adapter isn't as smooth as MF lens, adapter doesn't fit the a7S
Here's the VM35/1.2 compared to the Nikkor 35/1.4G btw:
Shot with the iPhone 5 and Hipstamatic app