As a professional graphics designer the answer is easy. Mostly because there can only be one answer. Sunset Overdrive. Dense polygon usage , shadows and lighting are way ahead of what Mario Kart is doing. From an artistic view; shadows and lighting is something we artist are taught to use from the beginning of our first serious art class.
So Sunset got it beat way too easily. Next I discuss textures but do I really need to? Of course I don't . Sunset has it beat again.
Everyone that that voted Mario Kart is wrong . They may say they like the look more but they can't say it looks better because that would make them a liar.
http://shonmac.deviantart.com/ [ PSWiiPCBOX ] Currently playing - Sonic Generations, Dust: An Elysian Tail, Strider, inFamous: SS, Forza 5, Titanfall