I did this thread about 3 weeks ago. Anyway, I think this might be an even fight, it really depends on if Solidus can get his suit of fast enough.
As shown in his fight with Raiden he can drop almost any part of the armor, so he might be able to do that before Volgin electrods him (he might be able to take the electricety for a little while though). If he does then the fight really begins. It also depends on if Volgin is fast enough to move away. Solidus runs so fast the ground takes fire, and he has 2 deadly swords that cuts through anything. But I think he is since most of his other physical abilities are on top.
But there is alot for Solidus to do to win this, and that would be if he knew precisley what Volgin was supposed to do. I give it to Volgin 8/10.