You dont have to get fingers 'even' for good result, but you can train them though so you at least have decent control. For a fast scales or whatever you can use tricks to get that sound even without having proper trained fingers, but with more complicated movements, especially with mozart and bach-like music you need alot of control. Chopin wrote his 10/2 for a reason 
gyzzzmo
Actually, you cannot get fingers “even”, even if you had too (whatever the results you are after).
Finger control is a different matter altogether, and why go for decent? Aim for superlative finger control. And why stop at the fingers? The fingers are the least important aspect (although obviously necessary) in piano playing. When punching, it is not the fist that matters, but the hip (where the power comes from) the feet (which gives you the stability and grounding) and joint alignment of the whole arm. In fact, if we want to be serious in this, we should start with mind control.
But look at the title of the thread:
Finger
evenness (not control) in executing fast runs.
Sure finger control is the issue, but how can one even begin to address it, when the attention is completely focused on the non-problem of finger evenness (or strength, or whatever?). One ends up by spending all the time dispelling this comedy of errors, so that the real issues never get to be addressed.
As for Chopin, do you actually know the reason why he wrote Op. 10/2 (or any of the Etudes for that matter?)
Here is a clue:
"
People have tried out all kinds of methods of learning to play the piano, methods that are tedious and useless and have nothing to do with the study of this instrument. It’s like learning, for example, to walk on one’s hands in order to go for a stroll. Eventually one is no longer able to walk properly on one’s feet, and not very well on one’s hands either. It doesn’t teach us how to play the music itself (nor what one calls difficulties), and the kind of difficulty we are practicing is not the difficulty in good music, the music of the greatest masters. It’s an abstract difficulty, a new genre of acrobatics." -Frederic Chopin
Best wishes,
Bernhard