Nico and Lewis are both able to extract very competitive lap times out of the Mercedes. Both are exceedingly quick and competent, what is confusing people is the "concepts" they and the media have of them and the deviation from reality. Lewis has recently been tagged with being exceptionally quick over one lap, hard on his tyres, reckless and driven by emotion. None of these tags were, or could have been attributed to him in his junior career or first season in F1. It was Lewis's studious, focused and very deliberate race performances that threw Fernando Alonso's world into a cocked hat.
In respect to Lewis being quick over one lap, he is nothing like Ayrton Senna, he has his moments but that is not his strength. If there is anyone (and Jenson Button might be one) who believes that it is, they are seriously underestimating Lewis. Nico has also been seriously underestimated but in contrast to Lewis, fighting for an F1 championship is totally new to him and there is without doubt a learning curve. Lewis is still learning, even Fernando Alonso is still learning, Nico will undoubtedly learn and people should use their tags advisedly as labelling, underestimating and writing people off is fraught with danger.