The Sony a1 has arrived and the Nikon Z 9 was recently been announced, so it's now Canon's turn to make an announcement about its forthcoming top-end camera, the R3. Last month, I compared Canon's then top-end R5 to Sony's and Nikon's offerings, commenting on the different strategic approaches of the three companies. Now that the R3 has arrived, what does it say about Canon's approach to the burgeoning mirrorless market, and what are the portents for Sony and Nikon?