While both the EVO II (8k) and EVO II Pro (6k) boast top of the line Sony image sensors, the EVO II Pro features a full 1” sensor and an aperture that is adjustable from f/2.8 to f/11. This larger sensor provides over 4x the light-gathering area and combined with the adjustable aperture enables the discerning photographer to take advantage of a wider range of shooting conditions.