I don't know if you're talking about me (here being this board), but from talking to IPs at the Belle Chasse airshow and comparing notes, I'd imagine the L-39 is a good bit more controllable.
However, you have to compare apples to apples. The L-39 is more comparable to the T-37 than the T-38. It's a single turbofan jet: Vso: 89kts, Clean: 100kts, approach speed is 110kts. Cruise is just over 300kts. It flies like a Cessna (I went from 172s/152s directly into the L-39 and had no problem landing it my first time).