FWIW, I seen the various 1/144th Panzer Korps "Morsers" on a store shelf. The Leopold was not in stock.

Two of the Morser offerings have "observation panzers" included; one has a PzIII, the other a Panther.
Can't recall which Morser comes with which - the basic differences between the two Morsers seem to be the barrel lengths.
Regardless, neither of these "observation" panzers did anything for me to warrant buying one of these sets.

The two other "Morser" sets being offered look to be the same guns, but come with crew figures instead of an "observation panzer". Would make for a nice dio!

So, make your choice, a Morser with crew figures or an "observation panzer".

And, each was under $10.00USD!! Great!