Something's off. 12 hours of idle battery life is unnaturally low.
A while back, NBC reviewed the HP Spectre x360 and Asus Zenbook UX360UA with the same 57 Wh battery capacity as the Yoga, but both lasted over 20 hours and their CPU is i7 whereas this is i5. Other Full HD touch screen laptops of similar caliber usually also scores around the 20 hour mark on idle.
Maybe just an anomaly of this review unit?

https://www.notebookcheck.net/HP-Spectre-x360-13-w023dx-Convertible-Review.180538.0.html
https://www.notebookcheck.net/Asus-ZenBook-UX360UA-Convertible-Review.181132.0.html

How about the keyboard backlight. Didn't see anything mentioned in the review.

1. How do I find out which one is mine?
2. Is the display in this review the same as the "Narrow Bezel FHD Display" that comes when you order the IR&HD Web Cam.
3. Would calibration bring any significant improvement? (I see there is a calibration file attached in the review)

There is a lottery of Full HD displays on both the X1C5 and X1Y2. You either get a superior AUO (AU Optronics) one with 85-90% sRGB / 60% adobeRGB or a BOE (Beijing Optoelectronics) one with 60-65% sRGB and 35-40% adobeRGB. Brightness and contrast ratio is also distinctly superior on the AUO panel, whereas the BOE just barely meets the minimum that is 300 nits / 1300:1. In case of the X1Y2, another FHD supplier is LG that currently produces to an equal standard as AUO, unlike some few known cases in the past.

Other than these two, All other FHD displays are same as BOE at color saturation, except with less brightness at around 260 nits and less contrast at around 1000:1. An effort from Lenovo to upgrade (just little enough not to lose buyers) since the last 3 years (220 nits, 700-800:1, PWM). But clearly they're still very much unsuitable for any color related or outdoor field work/play, which is quite unfortunate.

Sony and Toshiba did a good job using good quality screens on their business laptops, as do Microsoft and Apple on consumer devices today. Toshiba Portege for instance packs a FHD display nicely made: https://www.notebookcheck.net/Toshiba-Portege-X20W-7600U-512-GB-Convertible-Review.207592.0.html

Mobile TechReview reports the FHD display covers 95% of sRGB whereas your review reports 59%. I'd really like to know whether one or the other is accurate for all x1 Yoga FHD displays or whether Lenovo's display supplier requirements are so loose displays can actually have a spread of 59%-95% sRGB!

95% would be acceptable for me
59% would prevent me from buying

The floating table of content is handy  ;D

The saturation sweep does not look like 58.8% of sRGB though. It seems to cover the blue and red well and only missed the green slightly.