Also, did you mean it was compressed heavily on MY mix, or during the recording process?
The first few seconds (introduction?) doesn't clip or appear to limit, but the rest of the vocal does - it all appears to stop dead at -11.5dB, so something somewhere has limited it to that level. Normally I'd have expected a better performance from a U87 - have you inserted a compressor on the Neve's insert points?
This sounds like it was recorded pretty close to the mic - it's almost blasting in places. If you are going to use a U87 that close, you need a good pop screen in front of it, and possibly a pencil strapped vertically to the front of the mic. No that's not mad - it directs any blast to either side of the diaphragm and is an old trick...
But in general, you are going to get a cleaner recording with more high frequencies if you under-run everything, rather than have it close to the limits, which it sounds as though it is. It's relatively easy to add effects afterwards to alter the sound if you want to. I scanned the log overall frequency response of your track:
... and there are a couple of things to mention. A large part of the slightly 'muddy' sound is due to the response peak that I've outlined in red. This is the 200-600Hz range, and if you have too much of this 'upper bass', everything will boom a bit - not pleasant and doesn't aid clarity. The area of the response that I've indicated in blue is the part that adds 'air' to the sound, especially from about 6kHz upwards, and that's looking a little on the low side. This means that the overall response slopes down to the right at quite a considerable rate - it should be more like 3-5dB per octave, and possibly with a slightly 'scooped' response between 800Hz and 2kHz, although this very much depends on the voice. With this mostly I'd reduce the red area, and just tweak the blue area slightly.
I had a quick go with the parametric EQ, and I think that these settings improve it somewhat: (YMMV, but this is in the ballpark)
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