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Thank you - that's really helpful.
By one on one (I'm rubbish with terminology), it's usually just me with them talking direct to camera, so generally get away without the need for much in the way of edits, or I can put stills over the top if really necessary. However I wouldn't be against using the 7d for an extra angle if I had it available and could make the footage match reasonably.
So far 4k hasn't even be a consideration, but it would definitely give me some extra options.
I've got XLR mics so being able to plug into the camera would cut out some effort afterwards.
I'll start to read up on Sonys. It's really good to have a starting point for what to research. Thank you.
ad441-
If you wanted two camera angles and to be able to match the footage relatively easily I'd honestly consider selling the 7D and the Tascam and buying two second hand A6300s (go for about 5-600 or occasioanlly less on eBay along with a K2M (or K1M - I forget which is the cheaper of the two - they both do exactly the same thing but one has to be mounted directly into the hotshoe, the other can be mounted anywhere and has a wire).
Canon and Sony, while far from impossible, are definitely not the easiest colour sciences to match.
Two identical cameras will help LOADS on that front. And if you're feeding into a linked XLR port you've got a really nice shooting package good to go. An alternative idea is that if you're shooting interviews 20-30 minutes or less in length you could always go 4k and crop in for a tighter view of the same angle if you need to make cuts/emphasise points etc. But remember with 4K the files are a bit heavier (though not enormous on the a6300).
Have fun researching and let me know if you have any questions. Always happy to offer spurious advice.
CYOA
For the price I'd say a Sony A6500 would do you very nicely.
If you want audio internally rather than using the Tascam then maybe an A6300 with K1M XLR module which slots into the hot-shoe. That'll give you very decent results and save a bit of extra faff in post.
The 65 and 63 both have really great (for the money) autofocus if that's your thing and the 4K is super sharp when downconverted to 1080. Native 1080 is decent but not as lovely as the 4k. One thing to note is that in 4K the A6300 overheats after about 30 mins of constant filming and needs to cool right down again. In 1080 it's fine.
When you say one on one - do you need reverses? i.e. two cameras shooting both? Or can you do noddies/questions separately with the interviewer after the subject has left?
I would avoid m4/3 unless you really want to invest in new lenses - converters can be a faff and you'll need to factor in a crazy about of crop (if you a wide shot you'll need to get a super wide lens to run on say a GH5. GH5 is a wonderful device but just may not be as practical as Sony - or as universal. Sony seems to be the general standard of filming at the moment (FS5/7 etc with A7S2 as a b-cam so the A6500/A6300 will match nicely if you're mixing footage from most other sources).