I'm a semi-pro pianist and keyboardist who has about 30 years experience on the instrument, and I found the CE-5/WM1A replay of piano fairly realistic with good weight and timbre. Not the most accurate, definitely not for reference, but definitely not thin. The inner accoustic of classical piano shone through. I love the Z5 - see my posts on the Z5 thread - but the Z5 has TOO MUCH weight on piano notes than the real thing. So is my MH335DWSR. The CE-5 does shows a more lay-back lo-mid range - and some male vocals may sound a tad thinner, but for the resonance and ringing of the piano it does fairly well. Rather than thin I'd describe it as a tad sweeter tone than reference. Of course if you ask me I'd prefer my UERR for critical listening on classical tracks anyday. I've tried the CE-5 on my old DP-x1 and also found some good synergy, but prefer that of the WM1A. My WM1Z also works well, maybe even better than my WM1A on low gain. My preference is still WM1A on high gain, balanced.