Not sure I can help you on sharpness since it wasn't the best of mornings with some smoke haze around.
I was using my old C8 (f10). As I remembered, the WO 8-24mm is not quite parfocal throughout the zoom range, needing a slight tweak at the opposite end.
I compared it, set at 100mm, to my Vixen LV 10mm eyepiece and the views were pretty similar (I'm no great expert on contrast, brightness, yet
). I think the LV has a bigger AFOV.
As requested, I set about trying it in the two barlow lens that I have. Observing Jupiter, it worked in both. I have seen other eyepieces that are difficult to observe through when barlowed. The zoom was OK. The eyerelief increased significantly and, even with the WO's eyecap screwed fully up, I had my eye above that to capture the full FOV without blackout. Given I was in a well lit driveway, this was a bit annoying since I was getting light spill around my eye.
Both the GSO 2x, ED 2" barlow and the Televue 3x (1.25") barlow worked well. By that I mean that you could get a good view of the whole FOV without blackout or having to hold your head too rigidly in place.
In the 3x barlow, at 24mm, I think it was, the FOV was 6 Jupiter diameters.
Now anything beyond 10mm this morning was pushing the seeing so I cannot comment on sharpness at the higher magnifications.
However, for fun, I finished on the Moon and used the eyepiece through two barlows (3x and 2x) and I was able to hold a reasonable view of a couple of craters comfortably.
I must mention that the zoom mechanism is not "loose", which is good, but it does maen that the screw must be done up tightly on the barrel to prevent the whole eyepiece turning. I have put in a different screw with a bigger knob that I can get a bit of torque onto
Cheers
Eric