ILCE-7RM2
FE 24-105mm F4 G OSS
77mm
f/5.6
1/30s
ISO 2500
Close up, I think I prefer the Sony (top photo). Slightly.
ILCE-7RM2
FE 70-300mm F4.5-5.6 G OSS
300mm
f/5.6
1/30s
ISO 250
ILCE-7RM2
100-400mm F5-6.3 DG DN OS | Contemporary 020
299mm
f/6.3
1/30s
ISO 320
But for the kind of photos I most often use this kind of lens, landscape shots, the Sigma spanks the Sony pretty hard, IMO. Especially at ~100mm.
All of the following shots were on a tripod, with IBIS and OS disabled, 5 sec. shutter delay, etc.
Here's a 100mm comparison of this scene:
ILCE-7RM2
100-400mm F5-6.3 DG DN OS | Contemporary 020
100mm
f/5.0
1/400s
ISO 100
And here's a 100% crop of that scene, Sigma on the left and Sony on the right.
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The same view at 300mm:
ILCE-7RM2
100-400mm F5-6.3 DG DN OS | Contemporary 020
299mm
f/6.3
1/250s
ISO 100
And again a 100% crop of that scene, Sigma on the left and Sony on the right.
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Here's another scene at 100mm:
ILCE-7RM2
100-400mm F5-6.3 DG DN OS | Contemporary 020
100mm
f/5.0
1/1600s
ISO 100
And a 100% crop, Sigma left, Sony right.
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And the same view at 300mm:
ILCE-7RM2
100-400mm F5-6.3 DG DN OS | Contemporary 020
299mm
f/6.3
1/1000s
ISO 100
And again a 100% crop of that scene, Sigma on the left and Sony on the right.
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When I ordered the Sigma, I decided that I'd keep it if it matched the Sony's IQ, just because of the 100mm extra reach. This test makes that decision easy for me. The Sony's going up on eBay.