When I use my Nokia phone camera I get nice results. When I use my wife's D750 (she's a pro, the 810 and D4's are to heavy) I am astonished at the images it pro

When I use my Nokia phone camera I get nice results. When I use my wife's D750 (she's a pro, the 810 and D4's are to heavy) I am astonished at the images it produces, especially with a fast 50mm or 85mm lens. The lens is probably the thing, it fills pictures with light like breath. But - others probably have other opinions...