Astral/H3X
Member
It's hard to find good apples to apples comparisons, but for whatever reason FF also tends to look sharper even with quite mundane lenses. Perhaps more so because of the low noise at base ISO.
The reason being that full frame has a lower pixel density on the sensor, so the glass itself needs to be less "sharp" in order to... uh, be sharp.
I'm sure there's a write up, but basically 24MP on a full frame has larger pixels than 24MP on an APSC, so an APSC is sort of "magnifying" the lens a bit making the lenses appear less sharp. It's *technically* just as sharp as on full frame, it's just that then the sensor outperforms the lens. You'd see the same shit on like the A7R/II, at 100%.