Thanks, but I'm looking for a definitive answer from a hatchback owner. HB's are typically shorter than sedans (or Koups in this case) and don't have enough room behind the rear wheels - thus the available width is constrained to the dimension between the wheelwells, not between the outer body panels. So although the HB has much more cargo space overall, it can't handle a long-ish item sideways.
A set of clubs do fit in the trunk space of my Forte5. I have a standard size carry bag and do not use a pull cart. If have a cart on your bag or needed to carry more than one set, you probably would need to fold down one of the seats and remove the cargo space cover.
It's not so nutty - I did exactly the same thing last time I was shopping. Eliminated the Focus and Mazda3 hatchbacks that way. I just thought this time, I could get an answer without leaving my house. (Nearest Kia dealer is miles away.)