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For some reason the Ricoh files are pretty sensitive to which converter one uses. I actually dropped Aperture when my most used camera was the GXR, as the conversions were terrible and just plagued with color artifact. I found RPP to be the best. It had the least color artifact, and the film emulations were outstanding. Lightroom 4 is adequate, but not quite as good. I never tried Capture One, but your posted photo has great colors!
Nice photo, but as far as the colors the sky looks too magenta on my calibrated monitor.