I won't presume to speak for Jimi. I'll just give my 2 cents on his comment. Harsh is probably the harshest way to describe it. IMO it's more harsh the way a good Strat pickup is more harsh than a PAF. Of course that's extreme but one certainly is more edgy and a little brighter than the other.
When I have my amp dialed in for my EVH the Wolfgang sounds a little bright, edgy, harsh if you want. When I have my amp dialed for my Wolfgang, the EVH sounds muddy and kind of lifeless. I've reached an amp setting that bodes well for both but it's taken a while. This way I can leave my amp alone and enjoy the differences between the two guitars.
Honestly, I don't like the clean tones of the Wolfgang at full volume from the guitar. They are too distorted. I either pot off to about 7 or 8 which gives really nice cleans. Or I just split the coils on my Standard. The single coil tones from the Wolf pickups are awesome! Potting off the EVH in clean mode just makes the pickups too muddy IMO so I leave it up even though there is some distortion there too. Those pickups really have a nice chime though.
These guitars with coil tapping become extraordinarilly versatile guitars. I tell most people who care that the Axis SS is probably the best universal guitar out there. It gets the edge over the Wolf because the coils are already tapped in an interesting way and you can't knock the silent circuit. But the feel is different between the guitars and after I split the coils on my Wolf Standard it really became a universal work horse too. Obviously without the silent circuit but it really isn't very noisey in single mode.
I played a solo on my Standard with the neck pickup split in the studio for a friend of mine a few months ago. The engineer mixing down the cd couldn't believe the solo wasn't played on a Strat in the neck position.
It's all good.