I worked now and then for a friend who owned a photo shop. The big selling point for Pentax was and still is quality lenses and gear is usually the lightest in its class. Olympus was quite the same.
Today, if a person wants quality gear and light weight due to age or as a travel camera I'd strongly recommend something mirror-less. The only reasons to go "pro" gear are: 1) usually dust and water resistant, 2) titanium or steel bodies are virtually indestructible, the innards are tough also, 3) repairs are expedited, 4) holds value for resale when moving to newer models, the list goes on but, the bottom line is: It's what goes on between the photographer's ears that make or break a shot, no matter the camera setup. See the light, imagine the shot, take it, compare with what you imagined and screw around until you get the shot you want.
Wanna have some time well wasted? Grab a camera and anything, a can of Pledge, jewelry, a flower, anything. Set up on a table, kids are welcome to assist or take their own shots, imagine the shot you want, grab a lamp, maybe a piece of nappy cloth ( bath towels are great), and try to get the shot you imagined. A piece of white paper or art board makes a great reflector. Shoot it. Evaluate it. Reset and shoot again. Great for getting the creative juices flowing and reintroducing yourself to the kids.