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Hi Jeanette
When I compare the results from my older Pentax mount lenses to our newer Canon L lenses, a couple of noticeable differences are Chromatic Aberration and image softness.
With our (1990’s) Sigma 400mm F5.6 and (2006) Sigma 55-200mm for the Pentax, CA is clearly evident wherever there is high contrast. On stars for astrophotography and on the edge of e.g. branches against the bright sky for terrestrial photos. These lenses are also quite soft at full aperture, but they perform much better when stopped down a couple of stops.
Our Canon L lenses haven’t shown any CA on our terrestrial photos and are very sharp wide open, at full aperture.
So in my case, there is a clear difference between our previous budget lenses and the much more expensive Canon L lenses. I suspect that on 6”x4” prints, you would have to look quite hard to spot the difference, but on my monitor at 100%, the difference in image quality is very obvious.
Cheers
Dennis
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