Daniel Barenboim. He is one of the very few pianists of today who believes that personal expression is more important than mindlessly following the score, or abiding by the laws of so-called 'historically accurate performance' (for anyone not playing them on Fortepiano I think that is a useless goal anyways)
I think his way of dealing with music has much in common with my true pianistic examples, like Alfred Cortot and Robert Casadesus, who preferred an individual approach above being a servant of the score (and a self-perceived servant of the composer).
However, one thing I do not like about his sonata cycle: like most pianists he plays the first movement of op. 27 no. 2 in 4/4 time instead of 2/2 (which it clearly is written in, according to the score). The lack of emphasis on every 2nd beat per measure, is just a missed opportunity to add depth to the piece (often the notes there are echoed the measure afterwards, in the main melody, and vice versa). Andras Schliff gets this right but he gets the pedal use totally wrong, because his insistence on using it without interruptions makes his rendition a blurry dissonant mess.