Hi, I have both, and love both . . . though the Kimber Ultra CDP is at another magnitude of "finer" as a handgun.
I really enjoy my Shield 9, but the trigger still leaves a lot to be desired vs. that sweet, light single action pull of the Kimber.
Here are some targets fired from my Shield right after I bought it, and will various loads. ZERO MALFUNCTIONS, but the trigger made accuracy a challenge. And yes, I keep it loaded, cocked and locked in a holster. It is totally safe, including on the table getting its photo taken.
Just before last light I pulled out the Kimber, just to sell what it would do. I wish I hadn't done that. All five rounds, shot in one ragged hole at 10 meters, standing . . . as boringly usual, and that perfect, crisp trigger? Wow.
That all being said, I'm going to be looking for a companion Shield 45 soon. I surely would hate to lose that Kimber from the car on a trip or a LEO confiscation (temporarily of course).
Mine was purchased around early 2000, and is thus the original (non-Series II) version, and back when they REALLY did a serious "meltdown" on them. Sixteen years ago, it was $1,000 new. Like the Shield, my Kimber has never had a single malfunction in it's 16 years, except for lightly hand-loaded 200gr. LSWC, and only because the recoil was too light to work with that double recoil spring.
I absolutely trust my life to that awesome baby 1911 with any full-power self-defense round, but carry it with 230gn jacketed hollowpoints. Mine loves this weight and shoots 'em to point of aim. However, it has always shot slightly to the left since I got it. I've never felt I needed to drift the sight over that tiny amount, though I probably should go ahead and do it.
I absolutely agree with other experienced 1911-design shooters, the 1911 is a safer gun to carry cocked and locked vs. the striker-fired weapons to experienced 1911 owners.
BUT . . . the Shield has a lot of great attributes going to it these days.