They're going to have a hard time selling the M5 when compared to the M4 Pro. Geekbench for that chip is 3843/22332, which is slightly slower for single core but better for multi, but also has thunderbolt 5 instead of 4.
Fortunately they will be selling the M5 Pro against the M4 Pro (and more likely, their expectation is no one with the current Pro is going to upgrade for one generation) so it will be easier.