Of course Miami Vice was shot on film. Like all other filmed TV shows of the time, it was shot on 35mm, at 4:3 Academy ratio, protected for the "TV safe area." The only picture that is missing is info on all four sides that the viewer was never intended to see. (This was an issue when Star Trek: The Next Generation was scanned in HD for Blu-ray - there were shots that exposed equipment on the periphery, which was outside the "safe area" and never meant to be seen, and which had to be zoomed in to match the framing in the original aired versions. There were a couple times where they forgot to do this - the redshirt getting frozen by Q in "Encounter at Farpoint" exposes the blast coming from an air jet below frame.)
Also, an important point: Anything shot on 35mm film, that is not anamorphic or VistaVision, is 4:3. Widescreen is achieved by cropping off the top and bottom - this is/was usually done by the projectionist at the theater.
Some directors have shot films "hard-matted", placing a physical 1.66:1 - 1.85:1 matte box in front of the camera lens - the end result is a regular-sized film frame with black space at the top and bottom and a "widescreen" image in the middle. This is how James Cameron shot The Terminator and Aliens, and how Steven Spielberg shot E.T.
But TV shows were always shot in 4:3 with the intent of being shown in 4:3. IIRC, Babylon 5 was the first TV show to be shot protected for 16:9 (in anticipation of future HDTV broadcasts - B5 fans already know how this got screwed up and why we will probably never actually see the show in HD as was originally planned)