A full-frame’s sensor is essentially the same size as a 35mm film exposure. Larger sensors can accommodate larger pixels which in turn collect more light for cleaner images. This being opposed to intensifying the electrical signal and producing more noise (ISO). The larger frame also captures a larger field of view. Overall, improved quality & color.
Also, full-frame bodies are more robust and pro, making for better weapons in a crowd, need be… which means they perform better in harsh environments too.
Pictured is Columbus & Co’s 5D Mark ii, taken with the original 5D. 5D pricing is terrific used right now if you don’t mind sacrificing some of the mark ii’s features (movies included) and 10 more megapixel…. from there you can go up to the mark iii, but that’s another Canon article.