The dynamic range of the 5D4 sensor maybe slightly improved from previous sensors but it isn't a big issue for me but it could be an advantage for wedding images in low light

The 30 megapixel sensor creates a file size that does make a big difference in processing times and if you edit a lot of images it will be very noticeable. The upside is cropping in that you can still have a high quality image after a significant crop.

I am still working on a 2010 MacBook Pro with 6gb of RAM and the big files really can bog it down on some processes. I will upgrade eventually but I am doing mostly bird pictures and not in high volume so I can live with it. I'll wait until it can no longer function or handle updates to critical software. I despise the process of changing computers.