I've used CNX2 for years. All the photos I have on FAA were done with it. Now, I'm starting to use LR5. It has a lot of very useful capabilities, but a couple of crucial weaknesses compared to CNX2. The important things I miss are localized curve adjustments, and color control points. Those hurt. The rest, I can work with although I definitely do not like the set of 'sliders' for the basic curve adjustment ("exposure", "highlights" etc.) as opposed to an actual curve tool. It seems like a dumbing-down to me.
I greatly regret the death of CNX2 and I'm really PO'ed at Nikon about it, but it's a done deal.