Ambivalence

Finally I selected Canon 7D digital body for the next choice as a successor of 10D that had been used as long as 11 years. I have been at a loss which to choose, 5D Mk3 or 7D, I have wiped out my hesitation. The least modification in digital signal, want I reproduce the scenery by means of original lens physical performances. Though I know that it's possible to change the way of expressions by means of digital signal image processing, I dare put an emphasis on the Leitz theory, "Kante". My brain cortex must have be hardened with modification?