The A14 benchmarks are a very good indicator as to what the first generation Apple Silicon chips will be like in Macs; I personally expect even the thinnest & lightest devices to beat out almost all of the 2020 iMac lineup in perf, and push very close to the high-end i7 and i9

The big wildcard is graphics; Apple has to get from a 9,000-odd Metal compute score from the A12X to the 38,789 of a Radeon Pro 5500 XT in the top-end iMac today — that'll mean they likely need 4–5X the GPU cores, which seems very achievable in a Mac-sized thermal profile

Graphics is one of those things that can quite literally be solved by throwing more cores at it, once you have a proven, scalable architecture. I don't think it's outside the realm of possibility for Apple to match or exceed the AMD GPUs it ships today with its first-gen Mac GPUs