In a FPS like this, skill is a large and deciding factor in who wins in any given fight. I understand that, acknowledge it, and set the example. Those who try to say this isn't P2W, perhaps, haven't looked at it from a position removed. I don't want you to try and pick apart an argument to find what supports your position or belief - I want you to look at the merits of the issue and arrive at the reasonable conclusion. I want to clear up a few things.
There are items that only SC can purchase, yes? They are cosmetic only, so their impact on winning is negligible. The camo you can buy for infantry is a joke because the troops retain their faction colors; woodland cammies appear to be serious until you get to the punchline - brilliant blue and yellow helmet and trim throughout. The tank camo can be more effective, especially the winter skins equipped on Esamir. The vehicle camo suffers from the same faction-coloring as infantry camo and I see both of these as casualties of F2P. In order for the game to claim it isn't P2W, the camouflage (remember, can only be purchased through SC) can't be good enough to give you an advantage, so it has become less about a battlefield advantage and more about personalizing your avatar. Maybe that's important to immortals who have waged war for 300 years, or whatever. In PS2, one can be competitive without spending a single dime.
There has been an interesting culture developing in F2P games where gamers who don't buy any of the goodies available aren't doing the Right Thing. The game is advertised as being free-to-play, the developers are happy that so many can play with so little investment, the publishers like the insta-big player base, people appreciate free things, so why can't it stay there? Is it not enough to offer your support through playtime, the unavoidable shop talk amongst friends and forums, and appreciation for a job well done? I mean, the game is specifically titled free, so I stand beside the player that doesn't spend a dime when others call him or her cheap.
Finally, two highly skilled outfits are fighting over Vanu Archives on Indar - hundreds of players competing at an eSports level of skill. This is something the devs have expressed interest in and it sounds like they are pushing hard for an eSports angle in Planetside 2. The outfit that mandates a subscription to the game is going to have a significant advantage over one that doesn't. You cannot argue a 50% increase in resources will not affect the fight between the outfits. If the same faction mandates that every fighting member gets a boost... fuckin' fight over, folks.
They win.
Forgive me for the theatrics, I know there could be an underdog exception where the actual F2P outfits out there will triumph over the P2W outfits, but it is a long shot. Please, if you have evidence that proves otherwise, I'd love to see it. I want to end by saying that I love PS2 and I'm waiting for a good SC double or triple day so daddy can buy himself some sweet guns.