Anyone here with Quad-Core (i5 or i7) Surface Pro 7

The major difference boils down to the integrated graphics in those Surface Pro's. That Surface Pro 6 has been bogged down by its feeble-performing Intel UHD Graphics 620, versus the Surface Pro 5's Intel Iris Plus Graphics 640. And both Premiere Pro and After Effects, in their newer versions, have been increasing their reliance on the GPU performance.

That said, neither of those two Surface Pro's perform anywhere near as well as even a budget desktop PC or a more powerful laptop that sells for the same price as those Surface Pro's.

And the use of the lousy Intel UHD Graphics inside the Surface Pro 6 is an indication that Microsoft had jumped the gun on the quad-core Intel low-power mobile CPUs, as the i7-8650U used a Kaby Lake Refresh architecture, and Microsoft jumped on the quad-core low-power trend before Intel could release its Coffee Lake U CPUs with Intel Iris Plus graphics.

By the way, the Surface Pro 7 is powered by the 10 nm Ice Lake 10th-gen CPUs, with the quad-core i5 and i7 models now going back to using Iris Plus Graphics. Only the dual-core i3-powered Surface Pro 7 model uses Intel UHD Graphics. And now that the 11th-Gen 10nm mobile Tiger Lake CPUs are out, the Surface Pro 7 is now a bit outdated.