I have been waiting for a camera that performs well in low light and one that can also achieve good dynamic range. Having already invested into the canon system over the last several years, meant I would not switch to Sony or Nikon, even though they both have good performing cameras. My main shooter has been a 7D Mark II for the past couple of years.

Pros:
- Great low light performance. For me, easily acceptable images up to ISO 16000. Even ISO 25600, but it gets muddy.
- Dynamic range is very improved over my 7D Mark II & newer 760D; I can really boost those shadows several stops without added noise.
- 30MP sensor shows a lot of detail.
- Touch screen is awesome! I find my self missing it when I switch to the 7D Mark II.
- Focus speed is fast, but to be honest the 7D Mark II focus seems just as fast.
- Area focus zones, zone switch button, and general design carried over from the 7D Mark II - awesome!
- Focus point lights up in red.
- Exposure meter in manual mode at the bottom of the view finder, where it should be! 7D Mark II has this on the right side of the view finder.
- More customization of button functions, allows quick switch from One Shot to Servo
- GPS works, and works well, can leave on without battery drain. 7D Mark II took several min for it to begin logging.
- Over all build and sealing seems as good as the 7D Mark II.
- 1080p video @ 60p looks great! Does not overheat when shooting 4K.
- Takes same cards & batteries as the 7D Mark II.

Cons:
- Focus points are not far enough out, my 7D Mark II has a better distribution. I found I do more focus and re-compose with the 5D Mark IV.
- Lack of articulating screen. I think this could of been added while still maintaining the tank build of the camera.
- 4K video MJPEG codec - it has some benefits, but honestly the file size is too big to work with quickly. Sony Vegas chokes, but will work.
- No HDMI 4K out.
- Some lenses need peripheral illumination correction turned off for jpeg. Since it's a global setting, I just left it off. I shoot raw anyway.
- Battery life seems to be on average around 500-600 shots, I thought it should be closer to 800.

Overall I'm very pleased with the camera. I love the canon controls & design, as well as the auto ISO setup compared to Nikon. I'm not heavy into video, but I plan on mostly shooting 1080p, and I'll leave the 4K to my lx-100, so the lack of better 4K capabilities is only a minor annoyance. My old 550D would overheat when shooting 1080p, and the Sony cameras also overheat on 4K, so far the 5D Mark IV has been working reliably. On the stills side, the camera performs great, the sensor provides sharp images with very nice details, even though there is a low pass AA filter - good glass helps; like the 85mm f1.8 from Tamron :)