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They absolutely can be compared. But the Zeiss 135/2 must be put at double f-numbers to get the same picture (and double iso for the same exposure settings).
I guess you mean quadruple the ISO setting, not double (just correcting for anyone who might find this stuff confusing).
I didnít think Zeiss would make this lens available in ZE and ZF.2 versions, even after they announced the Compact Prime version. Itís a long time since 135 mm was a popular focal length, and the latest f/2.8 tele-zooms offer scorching competition to anything in their focal-length range.
Still, itís nice for Zeiss to display a full range of lenses from 15 to 135 mm. Itís a fairly complete range now. Next up: a fisheye!
Iím keen to see the new lensí performance, though I expect it to be stellar. Four elements of anomalous partial dispersion glass will make their presence felt, Iím sure. Not least on your next credit card bill.