The 2020 Mercedes-Benz GLS-Class SUV is a masterful blend of performance, comfort, and luxury. It’s so nice it’s hard to imagine how Mercedes will improve upon the GLS with a rumored ultra-decadent Maybach version, something to woo Range Rover drivers into its showrooms in the future. We rate the 2020 GLS at 7.4 out of 10, a figure...