That's good to hear. Treble detail is too much to expect from a on-ear portable as the purpose of isolation might get defeated if the bass is not punchy and a tad bit elevated beyond neutral. I still believe the Beyer DT 1350 is the best isolating portables out there, followed by the T51P. SQ wise Aedle VK-1 is the best I've got but am yet to hear the Oppo PM-3 and Meze 99.
As for the Sony MDR CD 3000, out of all the Dynamic Driver stuff I've heard it suits my preference, which is why I consider them the best DD's I've ever heard. The Sennheiser HD 250 Linear II is my reference for a number of years now and is still hard to beat, as to me it is the most natural sounding headphone out there because I've spent most of my hours of headphone listening with them and I believe people's preference towards sound signature is based upon what they are used to over a long period of time.
Anyway , CD 3000 is just everything one can ask in a headphone. It is the baby version of the Legendary MDR 10 and getting one in mint condition is not that easy. Larry over at headphile occasionally sells some mods or mint ones, you can always get one at Yahoo Japan and rarely on eBay. They are very efficient and can sound full bodied even from a phone, but obviously amplification helps a lot.
Sony is yet to make a successor to the CD 3000, but the CD 1700 has the same drivers as the CD 3000, minus the angular driver design . For now, am not looking for any thing new in the Dynamic Driver world, as the CD3000 has proven its test of time, when it comes to other great Dynamic's like Beyer T1, Senn HD800 and AKG K501. Technically HD 800 is the best headphone I've heard, but to me it is not enjoyable or fun over long periods of listening and I may not have a lot of high-end amps, but the HD 800 was used with a HiFiMaN EF6, Ressonessence Labs Concero HP (DAC) and Amarra Symphony Mac, when I came to my conclusion. I'm eager to hear what the HD 800S has to offer, but I'll not buy anything high-end in DD or PM in the next few years. Am leaning towards the Electrostatic offerings now and hope to stick to it for the long run.
So what are your long term ideas and directions that you intend to follow as a headphone enthusiast?