In 1970-72 I was recording at the Hit Factory in NYC with my band. We were being produced and managed by the chief engineer who worked there and he would book us studio time after hours and when the studio wasn't otherwise occupied. I learned so much during that 2 year period from him, and one day he told me something I never forgot. He said, "The biggest changes to the sound of the signal chain are at the beginning and the end. Everything in the middle only changes things a little."
In other words, choice of mics and speakers can often make a huge difference in what you hear and record, compared to choice of preamps, compressors or type of eq you use.
Based on his sage advice, I have more than a dozen mics. The first place I try to change the sound of what I'm recording is by mic choice and placement. It's the biggest "tone-changer" I own.
In my opinion, I'd keep the KSM, or trade it for 2 or 3 less expensive but more varied tone-changers. When I sold my Soundelux U99 and Blue Blueberry, it financed the purchase of a Stellar CM5 and CM6 which are very different sounding.
It's like a painter, you need as many colors as possible.