This weekend I tested out my new Canon 5D Mark IV at a football game between SMU and Baylor in Waco, TX. I've owned a Canon 5D Mark III for several years now so there wasn't too much of an adjustment other than one new toggle switch on the back to change auto-focus settings. It was also fun playing with the new touch screen that allows you to tap to change settings, swipe through photos and pinch to zoom. Pretty cool stuff.
The new 30.4 MP sensor is awesome. For something like football it really allowed me to shoot action across the field and still be able to crop the photo down for a clean shot of the action that was pretty far away. With the new sensor is you really have to the focus properly on your subject. If you miss the focus it's really apparent and you might notice that in some of my photos. But when it hits it is really sharp even with the ancient 100-400L IS lens I was using. The focus was fast and it's just a matter of user error for missed shots.
Now I know the 5D4 isn't exactly made for sports photography but for me it's the perfect compromise. The only options for "sports photography" are the Canon 1DX Mark II (Just too expensive for me), the Canon 1DX (Too old for me -- I like Wifi and touch screen) and the Canon 7D Mark II (Not impressed with the sensor, dynamic range or ISO abilities). The 5D4 comes in right in the middle with a fair price of $3500, similar auto-focusing system to the Canon 1DX Mark II, great sensor and 7 frames per second, which is one more FPS than I was getting on the 5D3. It's an all-around shooter and everything I'm looking for.
One thing to keep in mind when looking at these photos is most of them are heavily cropped and even at an images size of 2000px these are still pretty damn sharp. I could've used a better lens but I just don't have one right now. (p.s. a couple of these were shot with my old 5D3)