C7 vs C6 Allroad

Is an upgrade worth it? Anybody owned both, pref. 3.0 TDIs? Would be interested any comparisons - driving, ownership, niggles, etc. Have an option to p/x my 59 plate C6 (165k) for a 12 plate C7 (96k) which is less spec'd but price diff only about £7k. Have posted recently my deep admiration for current car and it is so smooth and has been well maintained so I think 165k is only half what it could do. Also it's a late plate C6 so most stuff ironed out by Audi, whereas 2012 is new so might have niggles. Someone once said always better to by late plate than early plate on any model. Also better the devil you know or time for a change? Would be good to get perspectives of those in the know! Thanks all.