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I actually have both. AMD 4650U at 15W already edges out MBA M1. 4650U is even plenty usable configured for 10W so a 4800U and 5800U should easily surpass MBP M1. Bonus is 4650U can hardware decode 8K 60fps VP9 video while M1 has semi-laggy software decoding.
Does that correlate to the (new) 4680 performance?
Doesn't put the AMD Surface (4680) in a particularly good light against the MacBook Air M1. Noisy fans, and not particularly competitive when unplugged. It even loses to the intel equipped Surface in some tests.
 
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