I did some quick and dirty math of my own based on information from the links Milich provided and came to the conclusion that 4 ACC > 1% Haste until either ACC is capped or total haste exceeds 55%. Does that sound about right to those of you that have spent more time looking at the numbers?
Yep, 4 ACC is +2% hit rate, which assuming near-capped accuracy (and ignoring Zanshin) will give you slightly more than 2% extra hits landed. 1% haste reduces your delay by 1% of your original delay, which at 55% haste will give you slightly more than 2% extra hits landed.
Zanshin actually skews the numbers a little in favour of haste, though. As a result, a SAM/DRG in "standard" haste gear with 25% gear haste and 10% Hasso haste is going to be reaching the 50%-or-so point where 1% haste beats 4 ACC any time he has any outside haste (meaning, any buffer, pretty much) as long as he leaves Hasso up for everything but emergencies. So, in party situations, it's going to be very rare that the extra haste from Dusk Gloves won't beat the accuracy on Askar gloves, and any time you have two (or, *shiver of delight* three
) sources of outside haste, the Dusk wins easily.
That said, I still prefer Askar to Dusk because I just really hate the movement penalty. SAM is my only job without +movement gear, and so feels sluggish already. With Dusk, I just don't want anything to do with it. So, I take the performance hit and wear Askar (which, conveniently, is also prettier).
If you wear the Dusk, though, then Askar still has a place in any "run to the next mob" macro, since it doesn't punish you much if you're slow to switch to Dusk when you get to the mob.