>>3300950I have used manual focus lenses to good effect on a DSLR with a split-prism focusing screen, so having an advantage like focus peaking in the EVF or digital split prism with a mirrorless will make things even quicker.
The lingering problem is that, in the year 2018, people have gotten used to autofocus. You may not realize just how much you rely on it, but you almost certainly will miss some photos because you can't focus fast enough or accurately enough.
For example, I was having a good time all day shooting stationary objects and people, but suddenly before me was a huge flock of 30+ butterflies. With my manual focus lens and split prism focusing screen (the prism is just in the middle of the viewfinder), focusing on a single butterfly suddenly became a real struggle. I had the option to either zone focus while stopping down the lens to increase depth of field or focusing on the ground and just hoping that a butterfly would come into the same area. The results speak for themselves...not so great. With a modern camera and AF lens, I am sure that I could have gotten some nicer pictures showing the entire butterfly flock by focusing on the flying insects themselves. I have seen photos in the /wildlife/ thread that people took with manual focus lenses and they almost always tend to be blurred to some degree.
I'm sure that skill does come into play, and with practice you can probably get slightly better results, but are AF lenses honestly that expensive? tl;dr, YES, adapted manual focus lenses on digital cameras is mostly a novelty thing.
