I have owned a few MKIV's and Currently own a 5153 50 watt head, the EVH's are more voiced towards the recto's, basically the red channel is damn close to the boogie red channel with a lot more compression and way too much gain. For awhile i was in love with my 5153 and I still do love it, but lately I have gone back to playing a triple rec reborn that I picked up. I do love compression but not all the time and it is just easier for me to use a recto with a boost and cut the boost if I do not want to much compression.
If I do play my 5153 I keep the gain just under mid point (noon) on the dial on the red channel and I do not use a boost except on leads. To be fair I have never played my 5153 in a band or gotten it really loud, but I do love it for a bedroom amp at low volumes.
The MKIV will have a lot more mids and is a different beast, if you prefer Marks over Recto's then I say stay away from the EVH unless you plan on using channel 2 all the time.