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I like the TMA-1 better than the HD25, indeed. For listening, at home and on the go, that is - for serious DJing the HD25 have the better form factor and clamping force, IMO.
Agreed. I would say that the HD25 isolate better as a result of that clamping force. I prefer the sound signature of the TMA-1 over the HD25, however I wouldn't call it an "upgrade" over the Senn, simply a viable alternative, that some will like better. I feel that the TMA-1 extends deeper than the HD25 and is a little more detailed, slightly less forward, and as a result having a bigger/better sound stage, albeit not huge in itself. I think that the TMA-1 is easier to listen to (although not laid back), has more fun factor.
My experience with the HD25 is limited to less than 30 minutes; I recently had an opportunity to listen to them.