A DSLR camera ,anyone from an entry level to a high end one of any brand,fixed on a stand,and by a remote or a self timer set to capture a nice landscape in the fully automatic ( P ) mode in an average or ordinary light conditions. How you will compare the very same image taken by a good photographer standing in the same place and using the same camera with his own tweaking and preferred setting for the shot. Technology have produced super good cameras capable of self acting intelligently in even some difficult light situations,and can cope with most if not all well to medium lit situations. I just want to know how much a good photographers could adds with their own preferred settings to the cameras in normal ordinary situations. My own personal and very private opinion that depends entirely on my personal experience would be that of 10 to 30% for the very same example mentioned earlier,what do you think , please?