You have heard Dverb right?
I first heard it when I got my first PT rig in 2000. I always thought it sounded grainy and flat, not much movement or lushness to it. Its a pretty standard dull sounding but somewhat natural lame reverb.
The lexicon is alive! It has much more depth and movement and lushness to its sound. The lexi may sound 'unreal' but it will make the source come alive. There are many more parameters to tweek to get a much better sound from the 480 than dverb, which has only 5 parameter but the lexi has over 30 IIRC.
You don't need to pony up $4k for the 480, try some demos of the Vahalla verbs, these kill dverb IMNSHO.
Also part of the 480 sound is the ad/da in it. I have a Sony DPS R7 and its from 1991 and it sounds so lush and alive I love it! The R7 does 40k sample rate and has 16 bit adda I think. This is part of its sound. Demo as many softverb plug ins as you can and see what works for you. You dont need
to spend the $4k on the 480 to get a great reverb.