There are so many benefits to using the R5 MKII in ES mode as opposed to the others. On the R5 MKII this is the default. As you no doubt know, the stacked backlit sensor is a feature of this model, and this addresses the issues surrounding rolling shutter etc on some of the other models that don't have it, but with the benefits of faster burst rate, higher shutter speed, silent shutter, low light focus performance. So much so that I use my R5 MKII (almost) exclusively in ES. Most recently for my Grandkids indoor go-karting in artificial (LED and Fluorescent with anti- flicker set) lighting. No blackout, no rolling shutter, plus: pre continuous shooting. And, there's no issues that bother me with dynamic range, if there was I'd change it, but I've not yet needed to for moving objects left to right, or right to left. BTW, I don't own a flash gun, don't need one these days. so not bothered about Sync speeds etc. Really, these days, in my opinion flash and lighting setups are for studio work.
