Has anyone run any comparisons between Ferret and Lucene 2.3.1?

I saw many comparisons between older versions claiming Ferret is 2x
faster but these are outdated and I cannot use these metrics to make
any sort of decisions. Lucene is claiming to have made major speed
improvements in version 2.3. While my company is looking into Lucene
2.3.1, I am trying to see if Ferret being faster and quite possibly
better than Lucene is a better direction (also I'd get a chance to
plug Ruby into the system :))

If anyone has done any metrics recently can you please post the
results you have, also please indicate how much time was spent
optimizing Lucene and Ferret, or only minimal optimizations were
attempted.

Thanks in advance to anyone who posts.