The best of my SACDs (my collection of which numbers about 15 so far) totally blows away anything I've heard from the Ikemi, including HDCDs. Even my girlfriend who was skeptical of SACD from the get-go had to admit that there was more air and space between instruments, more natural decay, and overall better dynamics - including microdynamics. Unfortunately not all the SACDs were as amazing and mainly it was the 'Pure DSD' classical SACDs (plus the Police Synchronicity on Sacd) that were truly amazing on the unmodded 9000es.
The difference between redbook andsacd was most pronounced through my stax sr-lambda (later sr-404 stax) electrostatic headphones, but I also noticed the difference using Sennheiser Hd600's with and without the cardas headphone cable upgrade. Even some older remastered recordings, such as the 'quad remastered' Elly Ameling (soprano) series had a much more liquid and organic sound on sacd compared to the same Schubert Lieder pieces performed by Ameling on my Phillips redbook cds.
If you get a chance to audition a 9000es (can't speak for the other sony's), I recommend bringing such disks as the Telarc Classic SACD sampler 2, The Rite of Spring (Paavo Jaervi conducts on Telarc), Brahms violin Sonatas (Csaba and Heisser perform on Praga Digitals label), Brahms' Clarinet Trio and Quintet (Opus 3 Label 'pure DSD' CD 22021), and Martin Pearlman conducting the Boston Baroque's performance of Bach's Orchestral Suites (Telarc Pure DSD). Actually all the classical SACDs I own sound very good and at least as good as anything played back from the Ikemi, but some are more obviously higher-res sounding, so to speak, than others.
The first two disks mentioned above are decidely superior in every way to any redbook CD I've heard on the Ikemi- no need for highly resolving speakers to hear it. I paid $600 for my 9000es at a local dealer, but much better prices (as low as $400-500) can be found online.
If and when I get the 9000es modded, I'll be sure to email you. For the time being I'm focussing on my analog front end (i.e. saving up for a used LP cleaning machine) , since as I mentioned before, I'm fairly content with the sound of SACD on the unmodded 9000es, having several SACDs lying around which are still sealed.