It's powered by the Qualcomm Snapdragon 662 SoC, but despite not having any bloatware, the 4GB vatiant that I had didn't offer a very smooth experience. The 6.39-inch panel has decent viewing angles, and colour reproduction is adequate and the display resolution is HD+.
Software is one area that is hard to find fault with on Nokia smartphones. It's stock Android 10 with just Google's suite of apps, a support app from HMD Global, and a Cinema editor extension in the Google Photos app for colour grading H-Log videos. The Nokia 5.4 has a 4,000mAh battery, which I found to be enough to get me through one full day of heavy use, and even the next day if my usage was frugal.
The ability to record in H-Log is a unique offering but the resolution and framerate aren't flexible, which might put many people off. The main camera also shoots decent still images during the day. Design and ergonomics are strong points for the Nokia 5.4, but overall, the performance is up to the mark.