Both taken from the same spot, with different subjects and different treatment.
The first image screams opulence, youth, maybe arrogance, but definitely status or the attempt to display it.
The mono version of this looses the critical gold of the phone and the complimenting background colours, but the Apple logo stands out more.
The second image has a much more humble feel. Someone, not necessarily worried, but with something on their mind, distracting them from presentation as they fall into habit.
The colour version of this image has a mish-mash of badly coordinated hues, cold and drab, but the mono version strips them away.