I like the look of the Zesty and from what I've read it's a great bike.
I have a 5, it's 3 years old now and the first of the kinked top tube models. The bike is just as competent going up as it is down and is a fantastic ride. I'm a bit of a sadist and like climbing (which is good seeing as I live in the Peaks) and I have no complaints about how the 5 climbs. It has Float RLCs and I've never found it necessary to lock them out or indeed require forks that wind down.
Climbing for me (and others on here according to this post) is about technique and body positioning on the bike.
Standard RaceFace BB on the 5 have been pants (some lasting 6 months some less than 6 weeks) and were eventually replaced by Hope Ceramic. Pivot bearings were replaced after 2 years which I think is reasonable as it's my only bike and its ridden pretty much week in week out in all manner of bearing eroding conditions.
Hotfly, I'd sit and ride all of the bikes you are interested in as it's the only way to make sure you make the right purchase. Good luck.