1) I'd love to see how this compares to the PPQ (probably the best striker trigger in the business right now)
It's one of the best out of box pistol triggers period, even when compared to non-striker fired guns. There is nothing currently in its price range that can compare in regards to trigger quality or accuracy, only triggers I've felt that are better were custom CZ's and highend/custom 1911's.
The Walther PPQ m1 (aka PPQ Classic) & CZ P07/P09 are the best 9mm polymer pistols currently available. However because they haven't been able to successfully tap into the LE market, and also because they don't capture the attention of the "tactitool" crowd... lower demand makes them difficult to get a hold of.
It might blow the Glock and M&P out of the water, but I seriously doubt HK will pull off a better executed design than Walther or CZ (although I would be happy if they did).