Wasn't the 20Da one of the first DSLRs to get live view? It wasn't just a 20D.
Back to the 60Da, does anyone know what filter it has (or hasn't)?
To quote Canon:
Increased IR sensitivity for astrophotography (IR cut filter is modified to achieve a hydrogen-alpha (Hα) light (656nm) transparency approximately three times higher than the EOS 60D) allowing crisp, clear images of reddish, diffuse nebulae.
So, did they:
1: remove the IR block filter and replace it with clear glass, for much increased Ha and IR sensitivity
2: remove the IR block filter and replace it with a weaker acting one, for increased Ha and some IR sensitivity
3: remove the IR block filter and replace it with a sharper UVIR block, for increased Ha sensitivity without significant IR sensitivity.
They talk about increased IR sensitivity, which is not really wanted unless you are doing IR imaging, since the focal point of most lenses at IR is different from that for visible light.