It seems there was a general consensus as regards the quality of 35 mm. Pentax lenses , and most of the oppinions ( Takinami , for instance ) stated that the best were FA 35 f/2 ( very highly priced second hand ) and the old K 35 f/3,5 in terms of sharpness and high resolution. I own the K 35 f/2 and the SMC Tak 35 f/3,5 .I consider the K 35f/2 as a very good lens, beautiffully buid, ( soft at f/2 ) with a amazing colours rendition , but in my oppinion doesn´t reach the level of K 28 f/2 or even K 28 f/3,5.
Today , with the advent of DA 35 f/2,8 macro limited and DA 35 f/2,4 perhaps the oppinions are different . Enclosed a comparison from a french photographer and Pentax fan between K 35 f/2 and DA 35 f/2,8 macro limited. Not bad results at all for a 30 years old lens ˇ
PENTAX SMC K 35mm f2 face au PENTAX DA 35mm f2.8 Macro Limited - Mon Univers Pentax
Regards