I think a mod 20D is even more sensitive Bert, but I'm not too sure.
I read the article in AS&T and they compared the three cameras, 20D, 20Da and a Mod 20D.
Because the Mod 20D had it's filter taken out it was more sensitive to Ha but was not suitable for daytime shots without special filters on the lens.
The 20Da is ok for daytime but I've not tried it yet. I'll post some ASAP.
That's as much as I know.
