Interestingly, I took three shots at 35mm and f8 with the three lenses I have that can do this focal length - 20-60, 24-105, and the Sigma 35. It was hard to tell them apart to be honest. If I had to pick a sharpness winner though it would be …. the 20-60. Strange world.
But I do think there’s a slightly different look to the Sigma lens - there’s just that little bit more pop and a “feeling” of extra definition. Pixel peeking reveals that it’s not any sharper though. Maybe this is the famed “micro contrast”?
The 20-60 performs well above it's weight if you ask me.. constantly surprises me and I have found myself leaving the 24-105 at home in it's favour.
Of the four Sigma contemporary primes I have, the 65 f/2 from wide open and on, is the sharpest, but I'm a fan of all of them , generally I'm more interested in the colour and rendering of lenses than the sharpness. I would really like Sigma to add a 135mm to the contemporary range, tried the 1.8 but it's just too hefty for me, I have a couple of 135's I can adapt but would be nice to complete the set!