>https://www.usa.canon.com/shop/p/rf1200mm-f8-l-is-usm-lens
"Minimum focus distance of Approx. 14.1 ft. / 4.3 m. "
Which is conveniently able to be measured by taking the distance from the camera mount to the end of the lens, then doubling it! However, at least this is "affordable" enough to have a price listed. The Leica lenses I was referring to has the "oh boy, this is going to be expensive" infamous Find a Dealer button. Also, it's a set of 11 lenses, and for nearly double the price, they add in a few more wide angles and a few more telephoto lenses to the kit.
https://www.usa.canon.com/shop/p/rf1200mm-f8-l-is-usm-lens
but the f5.6 version... doesn't seem to be:
https://www.the-digital-picture.com/Reviews/Canon-EF-1200mm-...