Couple of things:
I've found that you need to adjust the Highlight and Shadow sliders quite a bit in order to get the tones looking similar, depending on how you've set your Highlight and Shadow Tone in-camera. You might also want to try setting the Curve (in Base Characteristics) to Film Extra Shadow then using the Curves tool to modify contrast a bit.
Second, by default I don't think C1 applies Light Falloff correction, so you'll have more vignetting than you see in the JPEGs.
Thanks for your suggestions.
I thought that the C1 Simulations also adjust the interpretation of shadows and highlights by themselves?
By the way: I already tried to match the colors and shadows/highlights by myself, but while the harsh overexposure in the face can be adjusted, the colors of the skin, the grass and the hedge still don't match the original OOC JPEG of the simulation.
I also have other examples where I compared the Velvia Simulation, on a summer scene with the blue water of a swimming pool, colorful sunshades etc. and there the colors and the shadow/highlight handling are off too.
Don't get me wrong - if you don't have a direct comparison the profiles are OK, and a welcome addition to the workflow.
At least they are similar to the original OOC simulations.
But what really bugs me is the fact, that the included simulations in Lightroom are almost 100% perfect in comparison - in colors AND shadow/highlight handling. They just look exactly the same like the JPEG.