Hmm, nobody but you can answer that question.
I'll say that based on the headphones I've heard, if we put the TH 900 and Audeze LCD 2's way into the "euphonic" territory on the one side, and the Senn HD650 way into the "dull and boring" territory, the L300 is about slap bang in the middle. It is somewhat of a cross between the LCD 2 and TH 900 for me. The LCD 2 is smooth, intimate and cozy, but lacks the dynamics and impact compared to the TH 900, which kicks down the door and fires up a party no matter what. TH 900 is fast, aggressive and has a ton of life. But the TH 900 is also abrasive and rude, and lacks balance.
The L300 strikes a balance. Its not as smooth or laid back as the LCD 2 is - it is much too disciplined, fast and accurate. But it never gets abrasive like the TH 900 does. Or, I shouldn't say never. The treble is more sparkly than a lot of other cans, so depending on how sensitive you are, they might carry a bit too much energy up high.
If we say that TH 900 adds a ton of life and energy into a recording, and the LCD 2 adds a ton of uh... honey and warm hugs into recordings, the L300 is more on the analytical side of things to my ears. The main objective of the L300 seems to be to represent the music as it is, with a magnificent balance. It does not seem to emphasize anything in particular. As such, it is a technical masterpiece comparing it to the fostex and audeze. I would also say that it is much, much more versatile - for a one headphone kinda guy like you, I can't imagine something that is more versatile than this.
But I don't want to say the L300 is dull or lifeless. I think that a bit about the HD650, and I don't feel the L300 is the same way. There is more energy, more impact and life in the L300s.
Please remember that I just recieved my unit today, so take everything I am saying here with a gigantic grain of salt.