Is there Really a difference between a Krell 400xi intergrated amp and the newer Vandgard?


I currently own a Krell 400xi intergrated amp. It has 200 watts a 750k toroidal, balanced inputs, etc. Its very similar to the current vanguard intergrated amp in terms of similar spec's. I would like to know if anyone upgraded and if it was worth it? Is the sound different does it go lower, deeper, more of an open sound stage or should I just consider another route to improve what I already have.

thanks,

matt00
@dave_b Just wondering if the 400xi, which is obviously a much older amp, had low level hum and a high noise floor perhaps it needed to be recapped? Or at least gone over by a tech? I realize you got it just for the shootout and might not care to go to the trouble, but sounds like it wasn't performing up to spec possibly.
That hum in the 400 is interesting.  I agree that the Vanguard is the better of the two, but I don't remember having much hum or noise in any of the 400's I had/sold (I'm a Krell dealer).
Sdcampbell, I had the Hegel home and I found it hard and flat sounding.  A bit cold as well!