Will I really get significantly better shots with the M5? I doubt it.
Vs the SL1 sure you would. DPAF is no joke... after 70D/80D/7D2 and now 5D4 it's amazing how strong of a performer the DPAF is. You point... it's locked on no mistake. I'm actually amazed and although 979 is alot of money and I literally just bought the M3 for my wife not even two months ago I'm fixing to pre-order the M5 just to have the DPAF.
SL1 has one decent center point... M5 will have rock solid AF all the way out to the edges/corners.
The one thing I'm waiting to see if they do the minimum shutter of the EOS series for my wife this would be a killer option.
She has the 80D now and it is a better camera BUT... she doesn't want the size anymore and loves the size of the M3. I haven't pre-ordered yet because she hasn't complained about the M3 yet and so far has been happy with the focusing.