It is only medium megapixel, 5MP is a long way from the 8MP of 4K,Not exactly a glowing review, seemed more focused on the lack of support rather than the product itself, the hardware I guess is meant to impress based on the numbers but it struggles in low light situations like other high megapixel sensors do, that aside it's not at all discreet and that's a potential issue depending on where you leave your car
IMX 291 = 2.9 µm² pixels6.82mp sensor but they're not using the full resolution capabilities for whatever reason, the form factor is the same as the IMX291 but the pixels in the IMX291 are almost double the size, don't need to tell you what kind of difference that makes to the low light performance