I have the HK45 & P30S . The P30 just feels like a slightly smaller version of the HK45. Think of it as the 45 fitting my hand like a well made glove,. And the P30 fitting like a tailor made driving glove.
I can not really speak of the 45C's because I do not own one.
I have the P30S and HK45. I use the medium backstrap and side panels on the P30. The HK45 feels appreciably larger in my hand. Interestingly, although this should point to using the small backstrap, I find the medium more comfortable for the HK45 as well. Go figure.
I have the P30 40 cal & HK45C. The P30 has the medium rear grip panel and the HK45C has the small grip panel in it. The HK45C small rear grip panel feels slightly larger than the P30 with the medium rear grip panel. The side grip panels on the P30 are large right, medium left. The P30 fits best with the afore mentioned combo.
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