Originally posted by creampuff
Optically, the FA77 is definitely sharper in the center while the DA70 gives more even center to corner sharpness. AF speed difference is negligible in most situations. Color rendition is much punchier with the FA77 while the DA70 like most DA lenses gives good overall contrast but more neutral color. If I had to choose, it would be the FA77 because the micro contrast is just that bit different.
Nice summarization creampuff, but I can't agree in this point based on my experience. I had both lenses and I definitely find DA70 sharper in the centre. Maybe just my copy of FA77 wasn't that good - it may be possibility.
Originally posted by creampuff There is no contest in build quality between the two. The FA77 oozes quality while the DA70 appears cheap in comparison, the former is twice the weight of the former. The chrome/anodization on the barrel is a lot thicker on the FA than the DA. Both lenses have ridiculously short hoods that may work well for film but seem too short for digital. I find the FA77 does well without any filters in front due to the larger amount of glass. My conclusion... FA77 first, DA70 second.
I had it just opposite. My DA70 looks to be very precisely assembled, focusing ring is much more smoother, definitely a step above FA77 I had. Both again it is nitpicking, both lenses are higher quality then rest of pentax AF lenses.