Elindor, yes, the effects that each point of wpf grant stay exactly the same.
Gotcha...something interesting to remind people of then is this quote from WaltF4 in the game mechanics megathread:
To put this in perspective, a level 30 character with 3 agility, no weapon master, and 110 polearm proficiency would attack ~5% slower than a level 30 character with 27 agility, 9 weapon master, and 180 polearm proficiency if both characters were to use a speed 94 polearm. The absolute difference in time per attack between these two characters would be ~0.06 seconds. This is significantly less than the 12% difference in attack speed one would expect if agility was providing the purported 0.5% reduction in attack speed per point and the difference of 70 proficiency was ignored.
With that in mind, after the patch, someone with 0 polearm WPF will swing around ~8-10% slower than someone with 180 polearm WPF from what I can tell. This would roughly equate to ~0.10 seconds instead of the previous ~0.06 difference in absolute time per attack between characters.
So, bottom line remains the same people - small differences in WPF between you and your opponent are not going to change speed difference more than a couple percent (and probably less than a tenth of a second).
What this patch will do (as intended) is make it so that people that do not invest hardly anything in WM will be somewhat slower as they should be.
Now, with the new WPF potential you can attain, characters who hit these 200+ wpf may be
significantly faster than those with lower WPF...
And someone with 250 WPF will attack about 5% faster than someone with 170 WPF it would appear, or 0.06 seconds difference in absolute time per attack.