Kevin Carter from DxOMark, on RX1’s Carl Zeiss Sonnar T* 2/35 lens:
The result is a highly attractive, if somewhat pricey, camera of uncompromising quality. The Zeiss designed, Sony made lens is an integral part of that. Its optical performance is outstanding, and particularly noteworthy for its consistent sharpness and homogenous imaging across the frame. With excellent image quality at maximum aperture becoming outstanding at f/2.8 and on, the Zeiss Sonnar T* 2/35 is likely to become a classic, against which all others are judged.
Its tie to the RX1 is the strongest, and weakest suit of this magnificent glass. But, being able to design optics for a single camera opens up many possibilities for the engineers and designers without the need to compromise, it’s like designing a pair of glasses for a specific person.
I have yet to read a published lens review that contains the word ‘perfect’, but I’ll take ‘close to perfect’ any day.