As others have said, Minolta didn't really get into the pro camera market. They made a camera called the XK (or XM outside the USA) back in the 70's that was a big, heavy, interchangeable finder pro system camera. It never sold well because by the time they introduced it, most pros were using older pro systems like the Nikon F2, the Olympus OM-1, and the Canon original F-1 (canon made 3 cameras all called the F-1...confusing!).
I have a Minolta SRT-101 that I bought on Ebay cheap just to use an obscure Chinese made Seagull brand 50mm f2 lens that I have. The seagull came on a Segull DF-1 body, which is a crappy made Chinese copy of an older Minolta model. The body feels like its gonna break when you put film through it, but the lens was very sharp and had better Bokeh than the Olympus and Nikon 50mm lenses I used. I got the SRT to have a well-made, reliable body to shoot the seagull lens on.
The SRT is well made, built heavy and strong, and takes good pictures. I later got a Minolta 50mm f1.7 and am impressed with it too.
My usual system is a couple of Olympus OM-4T bodies and 14 Zuiko lenses. Been using Olympus since I was 8 years old when my dad taught me how to use his OM-G. I think the Olympus has better fit and finish, though the Minolta is a well made camera. The OM cameras (I have an OM-1 also, which is a fairer comparison to an SRT since they're around the same age) just seem built a little nicer. My old OM-1 has a brighter, bigger, easier to focus viewfinder. That to me is the deal breaker....I have trouble focusing the SRT even in bright light, and indoors I can't hardly focus it at all. That's probably just my eyesight, but the OM-1 is MUCH easier to focus and my OM-4T bodies are easier still because I replaced their focusing screens with Olympus's newer 2-series screens that are brighter than the 1-series screens that came standard in every OM from the 1 to the 4T.
If you're considering an OM-4 and can find one you can afford, go for it! I LOVE my OM-4T bodies. I also have a Nikon F4 and its just too big and heavy. The OM-4 is small, light, built like a tank, focuses fast, and has an incredible meter, and OM lenses are excellent.
Minolta's SRT-101 is built strong, and has excellent lenses but its harder to focus and has a primitive metering system. They're cheap though. I paid $25 on ebay for my SRT (though it looked like new it needed a CLA for shutter tapering that cost me $100...but the total $125 got me a new-looking camera that worked like new and an OM-4 is a lot more expensive).
If you get an OM-4, get the newer OM-4T. The OM-4 ate batteries and is not fixable if it develops circuit problems. Olympus won't touch them and John Hermanson (the best OM repairman in the US) says he has no parts for them and Olympus won't sell them to him. The 4T is still repaired by Olympus and John H. hs parts for them too.