I have both, acquired 2nd hand. Very nice pieces, as far as manufacturing quality is concerned. As they are totally mechanical with no connection to the camera but the mount, they cannot fail (even the diaphragm needs to get closed manually). I like the handling and the slow photography it induces, but some training is required to avoid missing a step (such as: setting AutoISO off, closing the diaphragm...), and there are many steps : -1) set ISO 0) preset the aperture 1) open the diaph 2) frame 3) set the focus 4) close the diaph 5) set the speed 6) shift 7) shoot
da capo... if I remember correctly.
Also, the 28 especially can be preset and used without shift to shoot off the hip, in which case AutoISO and hyperfocal setting help. I have used both on FX (D700, then - rarely - D800), and also on m43 via Novoflex mount.
The primary use case for the 28, for me, was ambiental / street shots and cityscapes in Tokyo ; this is why I feel sentimentally bound to it. But the IQ is not very good. Resolution is not very high (even on D700, 12 M pixels), and the corners tend to be mushy, especially with shift, so this is no proper architectural lens. Distortion is also quite visible on cityscapes; correction is made difficult when shift is applied. But it boosts creativity somehow. I did not pixel-peep the results for coma and flare, but night shots are generally OK too.
The 35/2.8 is significantly better, from an optical point of view: wider max aperture, lesser distortion, higher resolution... the lens (at f/8) still lags behind, say, the Zeiss 35/2 or Sigma 35/1.4 when using a D800, but at lower Mp, slightly pushing the contrast or clarity will do the job. Also, quality degrades less when shifted. But I found the shift function less useful at that FL, so I did not use it very often.
If you are fond of 35mm and MF, this is certainly a nice allrounder.
