How viable is pure polearm dk in end-game?

What skills are we comparing here? If it's Polearm Crusher and Spear Crusher, then they'll both benefit equally from SE.
If it's Fury vs Crusher I am not sure. Either equal or some advantage to Crusher. I haven't studied this much

 

Crusher since it is the one that multihits. But wouldn't more hits translate to more chance for critical hits? Which was the reason why double shot is preferred over arrow blow? I think a rough estimation of hits per second is needed since PA has 1 extra speed to calculate the new value of SE's effect but I'm not so sure. Not saying SE will magically put PA ahead of Spear but maybe it'll decrease the difference between both.

 

Ah I see what you mean now. You're asking, if Polearm Crusher will benefit more from SE than Spear Crusher will, because of Purple Surfboards faster attack speed?

I am quoting this guy from this thread (https://royals.ms/forum/threads/effectiveness-of-speed-infusion.105994/), since he seems to know this much better than I do.

So in the end, I don't think attack speed matters in this case. Both will get an improvement from SE and they will just "compete in a higher plane" so to speak. The gap in between remains.

EDIT: I did a little test calculation in the Excel sheet mentioned above. Instead of putting Crusher damage at 170%×3 (=510%) I put it at (170%+15%×140%)×3 (=573%). This is a 12.35% increase in Crusher damage, and not surprisingly, a 12.35% increase in overall DPS. (Goes for both speed 3 and speed 5 - PSB and Sky Ski with booster)
I base these calculations on the above quote, where he states that "For [Dark Knights] you get a 15% chance to do +140% damage on top of the damage of the base skill itself"

 

Can anyone point me to a thread discussing how Sharp Eyes actually work? I confused myself...

And don't tell me to search the forums, it's a pain!

 

I think it's like % multiplies damage % for an average % increase according to this https://royals.ms/forum/threads/marksman-vs-bowmaster-damage-per-minute.34449/. So 15% chance to deal 140% more damage will be something like 0.15 x 140 which equals to an average of 21% damage? I personally just increase the number of 170% to 191% per hit for Crusher and 250% to 271% for Fury and the difference between PA Fury and Spear Crusher becomes 2~4% closer further depends on stat, but the difference of PA Fury and PA Crusher becomes extremely close like ~1k difference, in which PA Crusher with SE may be more beneficial if you get luckier with more critical hits(?).

 

Why not go hybrid drk? IMO you don't really gain anything by going pure spear or pure polearm since you have enough skill points to max all the core skills as a hybrid drk. Both masteries, both boosters, hb, roar, spear crusher, polearm fury, ele res, one more lv 30 skills (either spear fury or polearm crusher).

I personally went polearm crusher because I had a pure spear drk in 2008 GMS, and I never use my maxed spear firy. The end result is still the same. My hybrid drk has spear crusher, polearm crusher and polearm fury maxed.

Same core skills as pure polearm without maxing all the other skills you'll never use such as iron will, power crusher, and max sacrifice. You need at least 3 (I think 3 or 5 don't remember) sacrifice to add roar. IMO sacrifice is better to keep at lower level than maxed because it uses more hp at lower level. Maxed sacrifice takes out too little hp you run into situation where you need to spam sacrifice a lot of times to manage your zerk hp as pure build, instead of 1 or 2 times as hybrid build.

 

Personal preference.