B) Steadiness is better with 35, cameras with register pins provided. Unsteadiness is distributed over a longer piece of film holding the image. Additionally, positioning errors are less magnified from 35, equal screen sizes compared.
C) Dangerous ground for answering; some would speak of a typical 35 look but could never define it clearly. What we can do is divide the historical development into distinct optical and presentational periods. The pioneers, mostly trained photographers or vaudeville entrepreneurs tried out everything thinkable. With films from between 1888 and 1928 speed is erratic, aspect ratios wild, lighting chaotic, lenses everything from two- to six-elements systems. A certain standard had come along with the Tessar lens, orthochromatic raw stock, the 3-to-4 image aspect ratio, and carbon arc lamps. Then the talkies cemented frame rate, camera movements, indoor lighting level, normal focal length a little shorter. The next period must be labeled color with the inlay of the série noire, both streams in the light of high-intensity carbon arcs. Modern documentary production established itself during the thirties. The last major change to the 35 look came with wide screen presentation, xenon arc light, and coated lenses throughout. 16 to 35 was done since 1923 but Super-16 was not practised until 1970.
You cannot play 16 as big as 35. When a 16 original is enlarged to 35 grain is, too. As a matter of fact today’s colour stocks are more finely grained than the films of the fifties, Kodachrome being the exception that proves the rule. The worst time in terms of colours and pictorial quality were the late seventies. Lighting practice got a little sloppy then.