I have had Pentax equipment since 1968. I have also bought , used and still have Mamiya medium format, Leica Rangefinder, Canon, Olympus, etc...all film . You tend to buy stuff over half a century.
But Pentax has always been my main system. I've got an S1a, ES 11, K1000 (wife's camera *), K10D, Km, K5, K1 and assorted lenses, flashes, etc. So Pentax has been my main go to, but I've also bought/used other manufacturer's equipment through the years.
Around 1974, I just had my Pentax S1a , 55mm lens and a 135mm Takumar. That year I almost switched to Nikon. I had the opportunity to buy a new, old stock Nikon Photomic F with a Nikkor F 1.4 50 'normal' lens. I hemmed and hawed, but then decided on the Pentax ES 11. Came close to switching in '74.
Then in 2007, I thought about getting a Nikon D200. I hadn't really got into the digital SLR stuff yet. So I thought that would be the time to switch systems. I wasn't impressed with what Pentax had, digitally. But then they brought out the K10D and I was 'hooked' once again. Lots of features and what a camera...my opinion still holds true today about this model. Needless to say, I got the K10D.
Then in 2017 I decided to go full frame. I thought maybe I should make the break and get a Canon 5D111 and the 24-105 L lens. I talked to a camera store guy who really knows cameras and the business. His recommendation, get the K-1 as opposed to the 5D111 or the Nikon D750. Why I asked ? Because the Pentax K-1 is the better camera.
I bought my K-1 and I'm very pleased with it. So a Pentaxian for 50 years this past February.
I do have two other digital cameras, a Panasonic with a 'Leica; lens. The 'Leica' lens on the Panasonic us quite unlike my Leitz Elmar 50mm collapsible on my rangefinder...doesn't have the same quality to take pics at all. Also have a Canon G 12. digital. Good, little carry around camera. No complaints. Built well.
* Before we were married my wife had a Pentax K1000. I met her through a lonely hearts advert I had placed...looking for a wife. Must have camera. Send picture of camera.
No I didn't do that.
She did have a K1000, but that fact and camera were just incidental. I have to say that, she reads my stuff.