I've been lurking here for few weeks, but have not seen any comments as to "People's preference for Phantom for competition" which you refer to. I've read just the opposite, which is preference for regular steel sp01 for better recoil control due to added weight.
Sorry to not provide any assistance for your question, but I'm curious as to your source for "People's preference for Phantom for competition". Do you have an URL or reference to a source that I can look at ?
Only reason I can think of for preferring Phantom would be 1) Possibly better fit on a grip, given smaller grip and removable back strap. 2) Weight restriction issue with SSP in IDPA. I'm willing to bet that given that most people like the grip on CZ and weight can be reduced on SP01 just by a grip panel change, that most would prefer to go with regular SP01, tactical, or shadow, rather than Phantom.
Any way, I'm curious to know more about this as I'll be buying one of the cz for multiple use gun, which will include IDPA.