Apps do stuff. So an M1 running an app that does something can do it faster than an x86 computer running an app that does the same thing. For example, a benchmark that inverts a large matrix.
Performance can be compared across architectures.
M1 compares well with x86 Chips in the same category. Lets not forget that Intel is falling behind even AMD here, especially in power usage. The ryzen 4800u compete pretty well with the M1 on performance while not being on a cutting edge node.
Lets not forget that the M1 is on TSMC's newest and greatest node, Apple has a large advantage because of this. The Ryzen 4800U is not only a older design, but also on a older node. Apple's M1 is packed full of cache, on package memory, high sustained core clocks, etc. M1 is on a totally different beast than something like the 4800U which is more of an after thought. It has old GPU cores, heavily cut down cache levels, old accelerators, IO is more of a light evolution of what came before. It was a chip that was designed to be cheap and slot into existing designs.
M1 is an expensive chip. The 4800u is still faster in multithreaded workloads. Yeah the M1 can export a video fast, when acceleration is used. Toss a nvidia GPU onto a x86 chip you can turn the tables really quick.
The New AMD 5800U is overall a faster chip than the M1, but still falls behind in a few areas. One being single thread performance, it just doesnt have the sustained clock speed that the M1 has. It will boost higher for short period of time, and with apple's M1 already having higher ipc AMD needs the clock speed advantage. Big thanks to Apple's node advantage. Second is performance per watt, the 5800U really isnt any better than the 4800U. A move to 5nm would help alot here.
Apple's M1 is not magic, it is just well designed. For someone like AMD the design is expensive and doesn't really fit into the market they were trying to break into. I see AMD and Intel moving this direction in the future. Intel has been behind the ball and this is the route Intel should have gone years ago.
What the M1 really shows is how far behind other ARM manufactures are. Samsung is catching up quick. The current choice of ARM silicon for windows is really a joke. Much needed improved chips are coming, and most likely still be slower than the M1. The Samsung Chip with AMD graphics will be one of the first ARM silicon to really give Apple a run for the money.