While detected a very slight impact in sensor performance during our initial assessment (please see here), the overall effect on DR and color reproduction would be negligible in real world results.
In turn the benefits of improved resolution and detail rendering are tangible, albeit only slight and really only noticeable at the wider aperture settings. Of course it may well be possible to sharpen the RX1 files to match that of the RX1R although there may also be an increase in artifacts (that is out of our remit here, please look out for an in depth review of the RX1R at our partner’s website; http://www.dpreview.com/previews/sony-cybershot-dsc-rx1r/4). Without the OLPF in place it’s likely that certain files from the RX1R will include moiré or color artifacts, depending on the subjects. Given the two are listed at the same price, it’s not an easy choice to make.