I used that same model for 5 years until I finally upgraded in 2017 and totally regretted it, the upgrade was not worth it at all, I would have been just as happy with the 2012. I quickly replaced it again with the "Mea Culpa" 2019 where they added back in ports, etc, would have been just about worth the upgrade over the 2012, 7 years later, but again, not by a big margin.
The 2012 MBP 15" Retina was probably the only machine I bought where the performance actually got better over the years, as the OS got more optimized for it (the early OS revisions had very slow graphics drivers dealing with the retina display)
The M1 Pro on the other hand, that was a true upgrade. Just a completely different experience to any Apple Intel laptop.