Good question. The 2xAA format does seem to have been neglected lately.
If your L2D-CE is a few months old it likely has a P4, not Q4 emitter. I have some with Rebel 100, P4, Q2 and Q5 emitters. You will see a noticeable increase from the P4 to the Q5. And as has been mentionned, you'll no longer see the "flash". For now I still think this is THE 2AA light, regardless of the emitter.
Olight has a T25 scheduled for release within the next few days. If it is as good as their T20 2xCR123 lights, it will be winner.
If I were you, I'd wait to see how the T25 is received. If you just cannot wait, I am certain a Q5 L2D will please you.