From a feature perspective, there is not much one can gain from switching from one system to another (In either direction); at least nothing that will offset the costs that you will incur from selling one and gettign another. You will win some and lose some on either end, but nothing that you won't be able to live without.
I am a Phamiya user and thus, completely dependent on C1P, but there are plenty of Hassy users who are perfectly happy with Phocus+PS. Similarly, Hassy users love Tru focus, but there are plenty of P1 users who do portraiture without it. etc.
What WILL make a big difference is the ergonomics that you mentioned. This is extremely subjective and one can't put a price on it. If you feel that the ergos of the H system will make a big difference in how you work, then go ahead and make that swap.
This was one of the biggest reasons I chose to go with Nikon over Canon back when I started digital photography. I just could not get used to the Canon ergos and I felt that the Nikon ergos will let me forget about the camera and focus on the work.