It seems to be a recurrent theme with technology that an upgrade doesn't always feel like an upgrade at first -- mensch, just look at the history of Windows!
This reminds me also of WWII aircraft; I often felt the same way about the Me109E vs. the later models -- the Jerries had a great design early on, but they had to keep improving it, thus introducing new advantages
and disadvantages.
By 1942 I'd be more concerned with getting the latest radar detectors.
Mach's gut!