To my ears the A25s have a mid bass hump that makes them sound like they go deeper than they do. I don't like that, some people might. I think they have a very nice midrange, and smooth high end.
I'm basing my opinions on the Klipsch on KG-3.2's rather than 4's, but I think they are similar sounding. The Klipsch will sound lively and sound like live music. They're very dynamic. The bass will be more natural sounding (to my ears), but I find the 3.2's to have a little hole in the lower midrange, so sometimes pianos and acoustic guitars don't have quite as much body as I'd like. I think I've read similar comments on the 4's. The treble is to my ears more real, which is less polite than the Dynaco's. When the KG's are called upon to scream and shout, they'll do just that. The Dynaco's will pretend.
Neither is perfect. I like the Klipsch better. I like the dynamics. I don't like the Dynaco's bass, and I think they smooth things over too much. I don't like the Klipsch's hole in the lower midrange, but I'll take that to get the rest.