I'm going to have to go with the Sonnar (though I haven't used the Nokton extensively):


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Not entirely sure about my Nokton results... seems a bit wibbly wobbly... very different from my old sonnar. I need to practise, and look at Helen's flickr again...
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It's not a Canon LTM 50/1.2, which is both good and bad, which is why both exist.
Get some slow film (KB-25 perhaps) and shoot the Nokton in open shade wide open. It will be sharper with a touch more contrast than the Canon but the background (and for that matter, also the foreground) will likewise also differentiate. Enjoy!! 😉
I don't shoot 50mm very often, so I want to keep only one lens. Right now I have a Canon 50/1.8 LTM, Canon 50/0.95 and a C-Sonnar, and might buy a friend's 50/1.5 Nokton. I used to have a Nokton, it was my first RF lens, but sold it last year because I'd usually take the 50/1.8 out instead.
Pretty hard task to decide which will be the keeper, but I'm between the Nokton (sharper wide open, reliable but the onion rings bokeh doesn't please me much) and the C-Sonnar (lovely bokeh, tiny, but has a bit of focus shift and it's quite softer wide open). Both have some highlight aberrations in blue that the Canons surprisingly (at least to me, that is) do not show... which is not helping me make my mind! I'm considering taking the Nokton to a tech along with the instructions for the close focus mod and see if he'd do it for me... I have zero tech skills to do it myself and having a close focus 50/1.5 would be really sweet.