58/15's are currently my favorite PRS pickup, and I have tried many many examples of them all.
My Avatar PS SC 594 has a 58/15 in the Bridge and a 58/15 LT in the neck, and it sounds PERFECT!!
The 58/15 LT Bridge is great too. In the beefier SC body I have found that one to be great, but still I like the slightly higher output 58/15 in the Bridge position. (I think like 8.5-8.6K versus 7.8K, which other things like the magnets and wire type being the same?) In the DC 594's, on many of those that I owned, I felt they were underpowered and replaced them with something hotter.
53/10's are tough to come by. I finally scored a set from Japan earlier this year, and they are in my beloved SC 594 Prototype right now, they sound great as well.
I dug 59/09's for many years, awesome slightly higher output PAF's, 9.0 to 9.5 in the bridge, but while they are super clear, they don't have the chime and clarity that the 58/15 LT's and 58/15's have.
I am tainted against 57/08's because they have varied soooooooooo much over the years. They are like the Magic 8 Ball of PRS pickups, you get a markedly differently result each time.
I would bet that is not the case anymore, I should try a "Modern" set. In fairness to them, I have a had a couple of sets that were off the charts awesome.
If I were to rank them today, I would rank them like this:
1. 58/15
2. 53/10 (possibly outranking #3 by the psychological Unobtanium Factor!)
3. 58/15 LT
4. 57/08
5. 59/09
...mostly by my preference in the bridge, where I spend 80% of the time. I go for classic rock gain and crunch tones mostly, plus some clean to crunchy blues tones. My priority and context 2009-2014 was playing out with a classic rock cover band, 2015 to current I am just playing at home annoying my family and neighbors.
A couple more comments:
-Yes, the 85/15 is supposedly identical to the 58/15, but uncovered.
-The 5310 Neck is to die for.
-I don't think there is much difference between a 58/15 LT (which as we know is the same pickup for Bridge and Neck) and a 58/15 Neck - I would bet the former is an evolution of the latter!
-The 58/15 LT is INCREDIBLE in a Semi-Hollow PRS. Was awesome in my PS DC 594 SH with no F-Hole, and is equally stellar in my current PS SC 594 SH with an F-Hole. The Semi-Hollowness really brings those LT's to life, off the charts tones with that combination!! (Note the only other PRS Guitar model beyond the 594's with the LT's stock in the Core models are the Hollowbodies, and the PS Archtops have them as well, so PRS seems to agree...)
My two cents, from a guy who has owned exactly 100 PRSi over the last 10 years, over half of them Ted's and 594's, so 50+ guitars with 57/08's, 59/09's (the Bridge Pickup for the Willcutt Guitars WL Ted's) and 58/15 LT's, with a few sets of 58/15's and 53/10's thrown in there for good measure...