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Yes, EFCS is a good compromise with no limitation, except for bokeh (> 1/1000), but it use mechanical shutter

I know, like flash, this is why the mechanical shutter is always useful

Rollin shutter for moving subject, banding for artificial light (or use anti-flicker), for use flash, for long exposure, for 14 bits RAW and have the best DR. for 12 fps or less

RF 800 has slightly better contrast and better resolution at the center

RF 800 is probably better, I found it sharp, and it's much lighter : 1260g VS 2075g (1640 + 325 + 110)

I've replaced my 100-400 C Sigma with the RF 100-400 and i don't find they're so different for the bokeh rendition (and the Canon is sharper), RF 800mm F11 seems better.

Ask to Canon :-P

it's only true with EF lenses

For your R6 no, except you expose sensor with dusts, but with some EF IS lenses you can damage stabilization, power down is more safe

With EF lenses you don't have stabilization synchronization, it's not really different with optic stabilization alone (only IBIS 3 axes works), and sadly you can't have IBIS alone...

Watch this ;-) : https://www.youtube.com/watch?v=85XbSHv8v9U

For "magic" rendering and full body shoot a used EF 135 L F2 or EF 85 L F1.2

Because i didn't bought it for that, it's the best macro lens i've used and i'm sure it's good for portraits (like the EF), but i've already the 85 F2 and the 135 L F2 , the first for indoor ...

My RF 100 L has replaced a EF 100 L ;-), the RF is sharper at F2.8 and probably equal at the others apertures in the center, but the RF is incredibly good at the borders and corners, even wide ...

I've both too and not the same experience, my 85 F2 is not as sharp at F2 than my RF 100 L at F2.8, but at the same apertures he seem always sharper (at the center), even the RF 100 L is a very ...

85 F2 is very sharp, sharper than 35 F1.8, and you know STM motor (not very fast and not silent), it's a good portrait lens, but the 135 L F2 is a amazing lens, maybe not the sharpest, but if you ...

Did you try it ? It's not the EF 50 F1.8 II, my RF 50 F1.8 is sharp at the center at F1.8, maybe a little bit less than my 35 STM but perfectly useable, and just not only the very very center like ...

The Nikon is much bigger (and not small for a 50 F1.8) and the price isn't the same : https://j.mp/3zq1euA The RF 50 F1.8 is not a bad lense at all, it's sharp at the center even at F1.8 (if the ...

i'm not sure if EF 100-400 V1 is weather-sealed, for example EF 300 L F4 IS or 400 L 5.6 (same generation) aren't. I think RF 100-400 is a better choice, much lighter, much better stabilization and ...

only internal zoom can really prevent dust, i've had several weather-sealed zooms like this with dust, and personally i use a protector filter on my zoom