>>4211353With regards to IQ in all perfectly equivalent situations (so you're matching APS-C depth of field... which you probably won't bother doing in reality), a larger sensor is either
1: Not "zoomed in" on what the lens is projecting so you see more details and fewer small aberrations
2: Oversamples it so you can resize to the same MP as the low resolution or crop sensor camera, which reduces both aberrations and noise
So you can get some nicer looking pictures out of more lenses. ie: A fujifag, adapting the sony 50mm f1.8, would bitch and moan about sharpness but it would be great from f2.8 up on an A7c and dreamy/magic at f.18. Or if you had an A7R camera, you would be able to gain a significant low light advantage by using oversampling to optimize for noise and details and resize your 42-62mp down to 24-36. Or less, if needed.
You can also use non-equivalent settings and trade noise for bokeh. f5.6 and under with close-ish subjects there's always some bokeh so it doesn't really hurt the composition.
You gain an artistic advantage, which is more access to wider angles of view (you can always crop to lose it especially with high megapixel cameras, and end up with aps-c and full frame as options on one camera)
You gain a support advantage, because lenses for full frame mounts are much more common and therefore easier to replace or acquire for cheap
And with some cameras that's huge. You get entire DSLR lens ecosystems... with autofocus. Fuji doesn't have that. If you were to score a nikon Z5 with the FTZ II for under $1200, the lenses would pay for the difference and you'd have more IQ than an XS10 in more situations. Video lags behind on full frame because there's more sensor to readout but "recording with a crop" on full frame isnt so bad if your comparison is already cropped.
