Unsure about the lightening photos
I have a 7i that I am very happy with and it is similar to the 7hi. I am not the most avid photographer in the bunch but I know when I tried to get firework images to photograph, I had a very hard time. In auto mode it kept going to black and white and the images were blurry and hard to capture. It was also hard to get the focus just right. In manual mode, I had a hard time getting the settings just right for really clear shots. I'm no expert so other may have some good suggestions Lightening Shot settings but for everything else I have found the camera to work great.