While I generally agree with @Tetsujin's answer and approach to reproducing this effect, the sample images appear to have been created to specifically emulate a cinematic look. Because of this, I doubt that much time was spent fiddling with common photo editing tools. Rather, I suspect that a CLUT (color lookup table) was applied to a color corrected original. This technique seems to be more commonly used in video editing than it is in photo editing.
A CLUT can be created by loading an image, such as @AlanJurgensen's photograph, color correcting to neutral, then editing the image together with a color table. The final color table is the CLUT. Some techniques cannot be used, such as contrast masking.
These are the steps I used to replicate the "look" with GIMP.
- Levels with Luminance blending
- Desaturate.
- Swap Red and Green.
- Luma darken with copy of desaturated layer.
- Copy Visible, overlay, mask with grayscale copy.
- Copy previous layer, overlay, mask with vignetting.
- Copy Visible, final adjustments for export. (such as "crushing" levels)
Also, note that the original images exhibit ring-shaped or "bubble" bokeh, which is caused by the types of lens used to record the image (Cooke Triplet). (Different from swirly bokeh, which is caused by a different lens feature.)