Apple is known for the fact that she does not introduce most of new technologies into her devices first, but brings them to perfection and popularizes. Yes, there were face recognition technologies before Face ID, but it was the TrueDepth camera and unique software that allowed Apple to make a breakthrough in this area.
Face ID biometric scanning has gone far ahead of all existing competitors thanks to the so-called 3D sensor. So far, Samsung has only managed to integrate 2D sensors in the Galaxy S8 and Note 8, so their technology is inferior in speed, accuracy and, most importantly, security. The same goes for the OPPO F5, however, this situation will change faster than you think.
According to insider information, two Chinese manufacturers Android – devices, Xiaomi and Oppo, are integrating 3D sensors into their smartphones. It is reported that Qualcomm will be able to provide them with such components already next year. Qualcomm is partnering with Himax Technologies and Truly Opto-Electronics to create a “next generation” face recognition technology. The result of their work should be the mass production of such sensors in March or April 2018.
Note that there is no information yet on how accurate and safe the scanners in Xiaomi and Oppo will be. So it's too early to say that this technology will be better or at least on par with Face ID.