Henning : the Tamron SP 35/1.4 is truly remarkable, I bought a copy shortly after they came out. It is critically sharp right into the corners , with no colour, by f/1.8. It is however a beast, somewhat larger than the Sigma, so it's not a lens I take out every time I need a 35. The Zeiss ZE 325/2 is a very good compromise.
Mark, I completely agree with you concerning the new Tamron SP 1.4/35. Really an outstanding lens, especially at open aperture.
It is interesting especially for the Canon EF system film users, as they can use this lens without any limitations.
For Nikon users like me there is one problem: The lens has a fully electronic aperture control (like the latest Nikkor E typ lenses), so you cannot normally stop down the aperture with Nikon's film bodies, which all have a mechanical aperture control.
To use a different than open aperture f1.4 needs a trick: Put the lens on a more modern Nikon DSLR (bodies from 2007 onwards), switch the camera on, choose the aperture you want, put the lens off with switched on camera (the choosen aperture remains), and put the lens on the film body.
That is of course a bit cumbersume, and practical / possible in a studio, or table-top photography at home, but much less practical outside "in the fields".
Therefore for most Nikon film shooters the Sigma Art 1.4/35, Zeiss Milvus Distagon 1.4/35 and Distagon 2/35 are the best options for outstanding 35mm primes.
Test reports of the Tamron SP 1.4/35:
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https://www.lenstip.com/570.1-Lens_review-Tamron_SP_35_mm_f_1.4_Di_USD-Introduction.html
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By the way, there is another outstanding lens most film SLR photographers don't know: The Tokina Opera 1.4/50. That is indeed the Pentax DFA 1.4/50 lens, which is built by Pentax for the Pentaxians, but also for Tokina in a rebranding agreement / contract.
But here we have the same situation as with the Tamron: Because of the fully electronic aperture control, it is fully usable with Canon EF, but has the limitation explained above with Nikon F.
Furthermore we have the manual focus Irix lenses for Canon EF, Nikon F and Pentax K. In that line we also have some lenses which are significantly surpassing the older Canon, Nikon and Pentax lens designs from the 60ies, 70ies and 80ies.
And I am very curious to see the future direction of Meyer-Optik-Görlitz in Germany:
With their two latest Biotar lenses they have meanwhile added two lenses which offer a very good performance stopped down. So you get the "Swirley Bokeh" at open aperture, and very good sharpness, resolution and contrast performance (a bit) stopped down.
They explained several times that they intend to further widen their range of lenses including completely new designed ones.
So in total there are quite a lot of excellent options for 35mm SLR users (Canon, Nikon, Pentax) to "pimp" the performance of their systems significantly by better, much improved lenses (including the improved designs Canon, Nikon, Pentax have introduced in their line in the last years).
Best regards,
Henning