When I started my newspaper career I used three Pentax LX bodies and lenses ranging from 20-400. I had these fancy hexagonal shaped Beatie focusing screens in the cameras. This was a GREAT manual focus system. The Pentax A* 85/1.4 was one of the very best lenses I have ever used.
The EOS system was a solid auto focus platform and helped me with long lenses and sports, etc. But I have always loved all kinds of lenses and got into the "Alt Lens" movement and adapted all kinds of optics to the Canon EF mount. Problem is that all of the Canon digital bodies were just lousy at manual focus, especially when using fast f/1.2 lenses like the Minolta Rokkor PG 58/1.2. You get a bright image but not enough focus accuracy feedback. It looks like you have good focus but the keeper rate was a let down, even with different view screens. Most new cameras don't even allow to switch view screens anymore.
The mirrorless EFV cameras with zebra stripes, focus peaking and manual focus magnifying buttons are a game changer. But you need a camera with a high res EFV. So far the Sony a7RII is perhaps the best option. You can also easlily mount just about any lens on these cameras with little or no modification surgery. This all helps when focusing on razor thin subjects using funky projection lenses mounted in cheap(ish) Chinese helicoids.
I have not tried it but the Pentax K1 camera looks like it pumps out super great images. I am not sure how well it does with oddball manual focus tasks though.
---------- Post added 01-08-2017 at 12:54 PM ----------
I did get the Dukane 3" f/2.5 lens. It's tiny. Right now I have it wrapped in gaffer tape and stuffed into an old macro focus rail. Looks very cool. I think I will deploy this lens for tight close up subjects though. It really does not add anything at longer distances.
Last edited by Photomaximum; 01-09-2017 at 08:38 AM.