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tl;dr all the bitching ITT
I've been scanning lots of old film over the years and for 35mm I would absolutely recommend DSLR/MILC scans over anything else. Even the cheapest cameras are now 20+ MP, which is enough for anything short of technical film or the most carefully exposed Velvia. While there are some issues with color and lack of dust/scratch removal sometimes annoys me, it's faster, higher quality especially in case of badly exposed or faded film, and handles uncut rolls without the need for rare motorized attachments.
Uniform backlight was a problem 10 years ago, but now any smartphone or tablet with a quality screen (eg iPad) works great so no need to muck about with flashes, diffusers and matte glass.
I cannot comment on how it works for larger formats since stitching is a PITA and I've never done it, but I expect that high res modes in E-M5II or K-1 should be able to handle MF in one shot with quality comparable to a dedicated scanner.
