I'm a range voting fan for single-winner contests, but it's not clear to me that the likely outcome of range voting extended to a multi-winner contest is optimal.
It will tend to pick centrists
Range voting with honest voters seems to exhibit little or no bias favoring or disfavoring extremists in such pictures, whereas under the strategic voter model in which Condorcet winners always win when they exist, range is totally unbiased and coincides with optimal voting in the 2D-picture scenarios.