beagle1

depends on what you shoot -  wildlife?  portraits?  landscapes? I mostly use old DSLR lens with the M5 www.flickr.com/photos/mmirrorless

OK

OK, if the OP is eventually satisfied with those poor quality images so be it

probably not, if you like mirrorless then wait until the "R" drops in price I use the old Canon mirrorless M5 and DSLR lens and a couple 'pancakes" lens www.flickr.com/photos/mmirrorless

none of those appear to be easily used with your current camera gear but hey, what's another camera and more lens to add to the mound of camera gear ! www.flickr.com/photos/mmirrorless

Canon M100 is good and perfect for WDW (with "pancake lens") and a Canon mirrorless can easily use the big DSLR lenses.  I use the older Canon M5 www.flickr.com/photos/mmirrorless

but yet the OP refuses to post their "poor quality" images .....  strange

yes, it's a great time to be an "amateur pro" www.flickr.com/photos/mmirrorless

looks good www.flickr.com/photos/mmirrorless

if you can test it before buying (and refund) get the Canon 35 1.4 L www.flickr.com/photos/mmirrorless

and the OP should post those poor image quality pics! www.flickr.com/photos/mmirrorless

yes, true pocketablility requires few dedicated controls but you can carry a small mirrorless and two lens in a small waist pack I travel with a Canon mirrorless M5 and "pancake" lens www.flickr.co ...

I've been using the old original Canon 100-400 for years, (BIF and field sports) I tried the new Canon 100-400 and didn't see enough difference to keep it  (but others say the new MkII difference ...

looks good www.flickr.com/photos/mmirrorless

detailed reviews on both lens are here: www.opticallimits.com if you're using the lens for sports get the Canon either version (AF is faster )

that would be my guess

are you trying to use a lens that doesn't go as low  f2.8 ?

Canon 100mm 2.8 macro (non-L) Tamron 90mm 2.8 macro www.flickr.com/photos/mmirrorless

maybe you are expecting too much but post a pic with the EXIF data www.flickr.com/photos/mmirrorless

the 3rd party adapter I got on ebay for $25 was just as good as the official Canon EF EFS adapter www.flickr.com/photos/mmirrorless