And never mind the fact it's been circulating the 'net (and this site) for ages...
I'd guess it's bigger after photoshop than it was before.
The Photoshopping is pretty obvious in this photo (e.g., repeating vein patterns, to say nothing of the ridiculous proportions, which don't match the other photos).
Edited to add: The fact that one of the other photos is a frame of a video should also raise doubts.
Uh, I was just gonna say five inches. If someone bitched about my guess, then I would gently remind them that the OP said to guess his size, not guess well...