I think if any of the top 3 drivers (Alonso/Vettel/Hamilton) had that Lotus, they'd be close to leading the championship and would have gotten atleast 2/3 wins with it. Despite what Miggins says, I think he's been affected by being out for 2 years, he's been slower than Grosjean most of the time.
I'm a massive Kimi fan, probably more than Button! I would put them in the following order: 1. Alonso 2. Vettle & Lewis 3. Kimi & Button For me Kimi has at times shown incredible speed (probably more in his previous F1 career) without the car advantage some of the other drivers have had, and could have been at least a double WDC with better reliability and maybe a triple WDC with a little more focus. I think he has the speed of Vettle/Lewis the long game approach of Alonso and racecraft similar to Jenson, which is probably not as aggressive or direct as my top 3 - arguably both his and Jensons weakness!