They're all important, but arguably Ritchie was more directly influential to modern computing from a practical perspective.
Fortran? Better designed? You're the first one I've seen who claims that. I'm assuming you're referring to the Fortran 90 standard and later, which cleaned up the language significantly and gave it a lowercase name. But the FORTRAN before that was simply ugly. I wouldn't call it Backus' starring moment. I'd say his research on functional programming and being a member of the ALGOL committee was much more important.
Fortran ended up becoming more suited to a completely different domain than C, anyway. Numerical and scientific computing versus embedded systems and low-level programming with high-level imperative mnemonics.
Haven't read A Guide to Fortran Programming, but K&R is still quite great, nonetheless. Although its habits are outdated by now in favor of ANSI C, it's still a handy reference.
It's ok as system programing language for the bits you dont code in assembly but for a General purpose language you have to do to much heavy lifting with C and its derivatives for my liking YMMV.
Dennis Ritchie is certainly an important figure that every computer scientist should know about, but that post reads incredibly slowly and is filled with grammatical errors. Looking at the author's other posts, it appears that English is his/her second language, so I won't fault them for it.
Wired put out a nice, concise obituary soon after his death[1] and there are many other great sources online about his life and influence. I would definitely recommend reading up on him out if you don't already know much about his life.
I just started reading K&R coming from a intermediate Python background. Ritchie's style is both simple and engaging. End-of-section practicals are labeled 'experiments', and the hacker spirit pervades the book.
Even better, the tools that I was implementing were useful and it was joyous to use a pipe to redirect the program I had just written to perform a char count hist on itself. How meta!
This may sound trivial for the numerous pundits and gurus who make HN their haunt (salute!), but the feeling of joy and discovery is immediate, and the suscpicion that I will walk away from this book a better coder (:s/coder/thinker) is inescapable.
Ritchie's thoughts lives on, his body is just dead.
And (this might be herasy) C ins't even a particularly good language when compared to better designed ones like Fortran and Pl1/G.
And i think McCracken is a better language intro than K&R