It depends what's comfortable and efficient for the individual when body proportion, riding style, flexibility, core strength/stability, experience etc are taken into account. On both my road bike and my mountain/utility bike the saddle is a bit higher than the handlebars, works for me, might not work for someone else my height/on the same bikes.
On my Bob Jackson I'd actually prefer the bars about 1-11/2 cm lower but I haven't got around to getting the steerer cut down since I built up the bike and I don't want a stack of spacers above the stem. I'll get my back-side into gear and sort it sooner or later.