The two you mention are the sharpest pieces of glass Minolta sells! Remember as you get into the lower focal lengths that it becomes more difficult for a manufacturer to make a lens of the same sharpness as 50 or even 100mm. That aside, the 35mm f/2.0 and the 35mm 1.4 are both almost as sharp as the other two you have. Interestingly, Sigma’s 24mm f/2.8 is also very sharp (photodo 4.0) and as such well ahead of Minolta’s 24 f/2.8 (3.4). The 28 f/2.0 rates better than any other option at 28mm. So, if you like to spend money, and want only the best, consider the 28mm f/2.0 or the 35mm f/1.4. Also, the 20mm f/2.8 is an excellent lens.