Great equipment doesn't guarantee great photographs. But great equipment in the hands of an experienced, professional photographer can create opportunities for great photographs. Years ago, when I decided that this work was what I wanted to do, I made a commitment to obtain the best tools available for the kind of work I do. My theory was that I simply did not want to blame my mistakes on having 2nd rate equipment. If I fail to take good photographs, it's on me.
I'm a Nikon guy. I shoot with what I believe to be the finest DSLR on the market, the Nikon D810. My glass is also all Nikon... or more correctly, Nikkor. For wide angle shooting I use the Nikkor 14-24mm f2.8. For longer shots, I use the Nikkor 70-200mm f2.8. And my workhorse is the classic Nikkor 24-70mm f2.8 lens. I carry 2 D810 bodies when I'm shooting, with the two lenses I expect to use most mounted and ready to go.
Since I'm essentially a landscape shooter, I almost always shoot from a tripod, and again, I have what I consider to be the best on the market, the Really Right Stuff TVC-3X tripod and BH-55 Ball Head. This combo is rock-steady. I have always shot from a tripod, but I was stunned by the difference in sharpness in my images when I changed to my RRS setup.
I also have some specialized accessories for panorama shooting and for long exposure shooting, as well as a cable release, so I can keep my hands off my camera, another necessary technique to ensure maximum sharpness in my images.
On the road, I carry a Macbook Air and a 1TB external drive for temporary image storage. I keep two sets of images... one set on the Macbook Air and one on the external drive. I believe in redundance!
In the studio I currently work on an iMac 27" computer, customized with two internal, 1TB Solid State drives. For storing the massive number of images in my archive, I have a 20TB Drobo. This is essentially a storage drive, and except for rare occasions when I may choose to work on a single image, it is never used as a working drive.