I haven't got any experience with the lens you mention but I think how easy you find it will depend on the run of the focus ring. I have a few old M42 fitting lenses that don't have auto focus. It helps that these lenses were made to be manual as they are pre-auto focus so the focus ring has a much longer run than my modern lenses.
I have an old 50mm f2 on M42 which gives you almost a full rotation of the ring to focus, in comparison my modern canon 50mm f1.8 gives you barely a quarter turn.
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