Digital Photography Review has published an article with the views of four professional photographers about the new Nikon D4 and D800 SLRs. The photographers come from different genres of photography and are: Leon Neal (sport and news), Dan Chung (multimedia journalist), Neil Lupin (music) and Andy Sheppard (music). Overall, the reception to the new cameras is positive, and Dan Chung in particular seems to feel that the Nikons could now replace his Canons. The lack of a headphone jack and clean HDMI out on the EOS1-DX counts against it he feels, when compared with the D4 and D800. Neil Lupin is very positive about the increased low-light performance of the new cameras.
Although interesting, the article is only a pointer towards what the pros are thinking, as at the time of publishing, none of them have actually used the new cameras.