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I just reprofiled my ESSE 5 last night on my Wicked Edge Pro system. I went to a 20* angle which is what they claim to be the "stock" angle. The stock angle was closer to 22.5. It only took about 25 mins on the WE Pro system using the 100 stone. Another 15 mins using the 200 - 400 - 600 stones and the 10u and 14u strops and the edge is hair popping sharp. (I can't wait for the ultra stones to get here)
I do have a GATCO system (for which I do have ultra stones) that I could have used but it would have taken considerably more time.
I used it today to chop some wood and the edge still performed as it had immediately after the sharpening. Great knife and great sharpening system.
The Lanksy doesn't work well on blades even 4" in my experience. The 5 would give you the advantage of having a flat surface to clamp to but you would have to move the sharpener to another position, basically sharpening half the blade at a time, IMO.