Compared with the original, the Canon Speedlite 600EX II-RT is better, faster and with more stamina
Canon Speedlite 600EX-RT Flash [GN197] {Bounce, Swivel, Zoom} at KEH Camera
Canon Speedlite 600EX II-RT review
Vello Bounce Dome Diffuser for Canon Speedlite 600EX-RT
Canon Speedlite 600EX-RT Flash Review
Canon Speedlite 600EX-RT 5296B002 B&H Photo Video
Canon 600EX II-RT Speedlite, Photography, Photography Accessories, Flashes on Carousell
Canon Speedlite 600EX II-RT Shoe Mount Flash for Canon for sale online
Review - Canon Speedlite 600EX-RT
Improved performance of continuous flash by approx. 1.1 to 1.5x* for fast firing (up to 2.0x* if used with optional Compact Battery Pack CP-E4N).
Canon Cameras US Canon improved performance Speedlite 600EX II-RT, Black (1177C002)
Canon Speedlite 600EX-RT Flash Review
Flash sale!! Canon Speedlite 600EX II-RT price drops AGAIN to just $399
Canon 600 EX-RT Review, Is it worth the cost?