There are a lot of arguments out there about mirrorless vs. DSLRs. Both systems have their pros and cons but there are certain features on my Sony A7 cameras that I wouldn't be able to live without if I switched back to DSLR.
The main thing I tell people who ask me about mirrorless cameras is that the Sony full framed cameras have IBIS (In body image stabilization). No DSLR has this yet since I suppose it's complicated with the mirror and everything to fit that feature in the already larger bodies. This is a feature that once you try, you can never go back. It comes in handy more often than you would think.
This image was shot handheld at 1 second in the freezing cold while I was shivering. The IBIS is so good that this is actually 2 handheld images stitched together where there was no motion blur at all except for the cabs. It's 2 images because I couldn't get 2 cabs in the same shot, they weren't lining up the way I wanted. This photo would've been difficult to achieve without some sort of tripod since it would've been extremely hard to hold the camera stable enough. Now I have something to show people who ask me how important IBIS is.
Sony A7SII, Sony 16-35mm f/4 (iso320, f/4, 1s)
Here is a bonus photo of myself taken by Shane Drummond a few minutes afterwards before we headed to the train for warmth: