We'll start with It's My Year. I apologize in advance for the way this type of shimmer makes my camera freak out. It's like it can't properly focus on it because it's so blindingly awesome! This swatch is 2 coats, which looked opaque until the flash. In practice, I recommend 3 coats for this color.
You may find yourself thinking that this looks a lot like another recently released OPI polish: Rally Pretty Pink, which came out in one of the Serena Williams sets with Red Shatter.
Here's Rally Pretty Pink (3 coats):
Are they dupes? Nope! In the bottle they look much closer than on the nail. RPP is much, much warmer, more of a mauve than a pink, and the gold shimmer is much, much more apparent. Much, much. Haha. So, at this point, you're probably asking yourself what they look like side by side. Here you go:
That's IMY, RPP, IMY, RPP, from left to right. See what I mean? And now, of course, you're thinking that both of these polishes look a lot like another little pretty (which actually came out first) called Zoya Faye. Which I also happen to have (I have a problem... as my husband would say, "It's some kind of itis.")
From left: Zoya Faye (3 coats), OPI RPP (3 coats), OPI IMY (2 coats).
Obviously, as you can see, Faye and RPP are the closest of the three polishes. They share a softer quality, and a rosier, mauve shade. Equally high on the gold shimmer quotient. IMY is more straight-up purple, though it's still red-leaning. Between Faye and RPP, I'd say there are subtle differences. Faye is... slightly, ever so slightly, more subtle than RPP. I can't explain it, it's just softer. You most definitely don't need both.
Final summation: all three of these polishes are beautiful. You most definitely do not need all three. I prefer the OPI formula, so between Faye and RPP, it's RPP all the way for me. Faye is great though, so if you have it, rest easy. If I had to pick one of the three, however, the winner here is It's My Year. It captures the vibe of all three polishes, but I prefer the more vibrant purple base. If you're really into polish, you may be able to justify owning both IMY and RPP, but honestly, even that's overkill. It's My Year all the way!
Hope this helps someone out there!