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. My primary camera body is what I believe to be the finest DSLR on the market, the Nikon D850. 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 also carry a D810 body 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.
For the past couple of years I've resisted moving into drone photography, but I'm now fully engaged in offering aerial stills, shot from my DJI Phantom 4 Pro+ drone. Featuring a 20 megapixel sensor, the Phantom 4 Pro+ can produce excellent images for use on web sites, in newsletters and brochures, and can print wonderfully up to 24X36 inches.
In the studio I currently work on an iMac Pro 27" computer, Apple's most powerful desktop offering. I have multiple external hard drives in the studio, from a 20 TB Drobo 5D to a G-Studio 6 TB Raid Array, as well as a library of portable 2 to 4 GB hard drives for permanent archives of everything I shoot.