Your 50MM is awesome for that and no lens is going to handle it any differently. Why a large aperture? Are you looking for bokeh or an extremely shallow DOF? If your focus was off and you were having a hard time I'd have stopped aperture down from 1.4 to get that crispness in the subject. The background is a million miles away from you. You are still going to have it soft even at f/5.6.
1/200 shutter tells me you were using flash. Which is good and correct on the beach in back lighting, but you need to be in manual mode and set your own exposure in this situation. You can use a priority mode, but that requires some knowledge too and it's not a guarantee that your exposures would be the same.
If you aren't comfortable with full manual put it in shutter priority mode and shoot a shot of the sand with no sunrise/sky whatever in it. If it's typical brown sand those settings the camera chose are going to be pretty fair for entering into manual mode. When you are taking that shot use the shutter speed that is your sync speed. I think it's 200 for Nikon? And 250 for Canon? I used shutter priority precisely because of that. You have to have the other settings fall in around the flash in a minute...
Then you know that you are going to use a little bit of fill flash to keep the sky exposed properly while also exposing the subject properly, so reduce that exposure that the camera chose to accommodate for the flash. You can lower your shutter, raise your aperture, lower your ISO, whatever you want to do.