I had the luck of finding a husband who cared about me keeping my job. That meant sharing of the parental duties, except the obvious ones like breastfeeding. I noticed that not only his parental instinct was at least as developed as mine -- and getting better with each subsequent child, but also that he is more comfortable than me in this parenthood thing. The reasons being:
1 - he's more sure of himself than I am, because society taught him to.
2 - he gets less hen-pecking and judging that I do. With our first-born, family would let me know that I "was doing wrong", and I'd believe it (see number one). But a caring father is like a super-hero here and does not get that much crap. And also can find better company (but that's just here where I live I guess as I heard horrible things from other dads). Also random people compliment him for being so involved with our kids.
3 - he can lift 2 kids at the same time