Motorcycles: What would be the better buy: 2006 Honda CBR600F4i or 2015 Honda CBR650F?

I have a 2007 Kawasaki 650R and have been thinking of trading because I've had the bike since 2007, which I bought new. I've been thinking of the Yamaha FZ-07,
but some have said it's too similar to bother changing for. I've always liked the yellow 2006 Honda CBR600F4i. I've never ridden an inline 4 before. Would it be a better move to buy a new 2015 CBR650R
over the used 2006 CBR600F4i even though the CBRD650F is underpowered? Thank you.

p.s. I'm also interested in the CBR600F4i because I've read they're very reliable and long lasting.

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