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I'm leaning towards the Sonnar but could afford any.
Then I would get the Planar. Normally it wouldn't bother me the slightly wider aperture (especially when you are paying a bit more for it) , but the Sonar seems a bit flat compared to the Planar. For me, the weight would be less of an issue than having that nagging feeling that the other lens would take better pictures.
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I would totally without a doubt go for the 35mm 1.4. It's a brilliant lens. I love that focal length, not sure what kind of photography you're into, but i do street, documentary and portrait. I like using 35mm and 85mm they cover all the focal lengths i need.
But there is a way to get two lenses. Sigma's 35mm 1.4 ART Sony version. Along with the Canon and Nikon versions It has attained legendary status by now i think, I've had a go with it and it's an incredible lens, it beats or matches any other lens at that focal length. Crucially you can pick it up new under a grand and second hand for about 600/ 700. That would free you up to get a second lens maybe?
https://www.dpreview.com/reviews/sigma-35mm-f1-4-dg-hsm/5
https://www.dxomark.com/Lenses/Sigma/Sigma-35mm-F14-DG-HSM-A-Sony
I just got a Sony A7 II, i wish, wish i could afford for the A7R II. Good luck!
Not sure if anyone else has one of these, I'm basically thinking about getting one as I'm fortunate enough to be able to receive a discount on the body and lens.
The body I'm set on... it's going to be the a7r2 model:
What I'm not yet decided on is the lens.
I want a full-frame prime, and there's so much debate about it. There are three to choose from:
This seems to be a choice between:
Here's the side-by-side comparison of those:
https://www.dpreview.com/products/compare/side-by-side?products=sony_zeiss_fe_55_1p8_za&products=sony_fe_50_1p4_za&products=sony_fe_35_1p4_za&sortDir=ascending
I can only afford 1 lens, and can only get the discount once... so in some ways going expensive makes sense, but actually the Sonnar weighs the least... I'm leaning towards the Sonnar but could afford any.