Leica 35-70/4ROM vs Zeiss Contax 35-70/3.4?
I am currently using a Zeiss Vario Sonnar 35-70/3.4 on my A7, an outstanding zoom referred to usually as better even than the corresponding primes, at least the Contax 35/2, 50/1.7 and (perhaps, I've never tried one of those) 85/1.4. I do not want to discuss what better means in this context, as I understand each of these lenses have other characteristics that justify owning them, as wider apertures, different bokehs, etc.
Anyway, the Contax design is a push-pull one, good for film, but a real vacuum pump sucking dust and injecting it into the sensor chamber of the A7.
I am considering the Leica Vario-Elmar R 35-70/4 ROM, regarded by many as in the same league of the Contax zoom in terms of image quality, and being a two-ring design maybe more sensor friendly with regard to dust sucking abilities.
My question is, has anyone tried both lenses (it may be on film or digital), and is able to comment about differences or similarities in character, image quality, color rendition etc? Or point me to any online reviews? I have browsed the usual forums and reviews sites to no avail.
Thanks in advance
Buenos Aires, Argentina
[Sony A7R2, RX1R2, Nikon FA, Leica M6]