How much is p2w?
How easy is it to get my beloved KV2?
Pay to win: You can buy "Premium time" where you get more credits and experience, and there are also a handful of "Premium" tanks that you have to buy with real money, but they're mostly less-good than the non-premium tanks, and only good for credit grinding. There are also fancier rounds to fire, but they started selling those for normal ingame cash too
KV-2: It'll take a bit, depending on how much you play, it's Tier 6 out of 10.