As you ascend the organizational ladder what matters is your ability to organize and motivate others, relationship building and communication skills, and your general vision / insights / experience.
The above means that you can be pretty lazy later in your career if you are just highly competent at those things. If you are hard working it certainly helps, but give me a lazy but competent and fair leader over a hard working incompetent one any day.
However for bottom of the org chart employees hard work and accuracy of work are most valued.