Here is a round-up of hands-on reviews and previews of the brand new Canon RF…
Canon EOS 70D Sample Shots with Sigma 18-35mm f/1.8 (and other Canon lenses)
dc.watch.impress (translated) posted a set of samples shot with the Canon EOS 70D and various lenses, among them the awesome Sigma 18-35mm f/1.8 DC HSM (price & specs). The other lenses are the EF-S 10-22mm f/3.5-4.5 (price & specs), the EF 8-15mm f4L Fisheye (price & specs), and the EF 70-200 f/4L IS (price & specs). I was particularly curious to see the performance of the Sigma 18-35mm with the 70D – not bad at all! :)