I am not a gear head but I have over the years produced a lot a salable and usable pictures. I have done sports since 1997 both for a paper and in the last seven years for the club I shoot for now. Previously in swim meets the best I could comfortably do was ISO 3200 with a 70-200 2.8L shooting mostly at 3.2 or 2.8. I am always dealing with dual WB from window and artificial light. My earlier pictures were acceptable for the web but it was hard to get real sharpness because of minimally acceptable shutter speeds like 1/500th shutter speed or even a 250th in dark corners both with a 7D and a 70D. I just did a three day meet at Agannis Arena at BU with a 7DII. All pictures were taken at 6400 ISO. These pictures were exceptionally clear with good color because I was able to obtain shutter speed of a 750th to a thousandth or higher. I applied some noise reduction globally in LR. This increased ISO capability combined with improved focus, capture and tracking capability have really improved my work. Today after earlier web posting of pictures I printed some pictures for certain swimmers. The prints in color, sharpness and clarity exceeded my expectations. My keepers have gone up. I ultimately bought the 7DII because I wanted at least a stop better acceptable ISO for the conditions I sometimes shoot in and I wanted better capture and focus capability than I had been living with. The camera exceeded my expectations. I shot without flash in bad light for the first time in several meets. I work from the deck and can get quite close. I found the 7DII highly intuitive and it worked in all focusing modes and the tracking on starts was accurate and consistently in focus at 10 fps. As a long time cynical user of Canon products I thought some folks what like to hear about actual use of the camera.