bloodlemons
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I recently took the plunge on KT88s from EL34s in my ZMA and I am exceedingly happy. What you've already heard is true: lows go lower, highs go higher, soundstage is taller and wider; "sweetness" in the midrange is swapped out in favor of stability and realism. No particular frequencies appear emphasized or "hyped." Everything just sounds better across the board. (IMO; YMMV).
For comparison's sake: I was running RFT EL34s biased at 50 mA per Decware's ZMA manual. The RFTs sound really good; very sweet midrange. I am now running NOS GEC KT88s biased at 60 mA, per Steve's instructions via email shortly after I made the switch.
The GECs were kind of a holy grail tube for me, and I'm very happy with them. However, I tried two other sets of KT88s from different brands before settling on the GECs and the "KT88 effect" was in full force in all three quads. Not to say they all sound the same (they don't), but in my experience you're going to get the KT88 experience across the board so long as you get a dependable quad of decent quality valves. Many people seem to think Tung Sol is making the best affordable, mass-market KT88 right now, and the set I auditioned briefly gave me no reason to doubt that opinion.
If you do go the KT88 route, expect to give them 50 hours or so to settle in. I honestly didn't like the sound at first, thought I'd made a huge mistake and all that. It didn't take long for things to come together and now I only regret that I waited so long to try them out.
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