I'm a Sony shooter. If you shoot any kind of low light you'll notice the difference.I am not a huge believer in glass tho
It used to mean something u til autofocus took steroids
Not only will lightroom glass profiles fixe their issues....but what used to add value to those expensive glasses was minimized with DPAF and eye focus.
If ur not a pro who wants close to 100% reliability..u will do away with decent glasses.
But i am weighting ur point heavy tho...will let u know if i cop it.
50 1.8 unusable with AF in low light and is soft.
85 1.8 is sharp, but still hunts.
35 1.8 sharp and doesn't really hunt much at all in low light.
Tamron 28-75 is somewhere between the 35 and 85.
If you're always shooting during the day, MF, or a tripod then sure it might not matter.
Just my two cents.
Sony FE lenses are expensive in general so if you aren't getting the performance out of them it stings a lot more.
Granted I do a lot of paid work in less than ideal situations so I agree that's probably why it matters more for me now than 16 months ago.