The HK45 is a very nice polymer pistol and I do like it much. However, it does not work as well as my TRP and I was under no illusions that it would, really. The action alone would indicate that and since my TRP has a Smith & Alexander grip safety and an arched mainspring housing there's no way it would feel as good in my hand - the P30 is another story, however. The HK45 dissipates recoil very well, but not as well as my 1911. My split times are quicker with the 1911. Accuracy is a wash. Durability I would have to lean towards forged AISI 4140 with tool steel internals, but HK is no slouch in this department. Where I believe the HK wins is repair (if you have the parts and can do it yourself) where the 1911 will require an armorer or someone with gunsmithing skills if not a gunsmith... And the cost of doing a 1911 justice is costly.
That said my HK45 is going nowhere. For what it is (double column, DA, polymer full-size service pistol in .45 ACP it's "the best" to me.
There's room for both to me.