The trigger pull is soooo much better than a 642, it's very smooth and not heavy at all.
Compared to which Kahr? It's an alloy framed 3" 1911, so it will be heavier than say a Kahr P9, or PM9.
It all depends on what features you like, you're going to have a grip safety on the Para, not on a Kahr. Both have good customer support from what I hear.
I don't care for the finish on Paras unless it's a stanless model.
Try and find any Para LDA at a shop and ask to dry fire it.