I just have the Dell G5 5590 (i7-9750H, RTX2060, 144Hz screen) next to a Lenovo y540 (same except 1660Ti) and I am trying to decide between the two.
The Lenovo is quiet for a gaming laptop, under load you can of course hear that there is a lot if air being moved around, but it is still okay. That aside, the fan control charactistics are nice, too. No sudden fan speed up, but a moderate ramp up/ramp down of speed. The screen would be nice, too, if it didn't have horrible screen bleed, which is NOT only visible on a photo, but also clearly visible when playing games or watching a movie (that is the second copy that I have, and it is even worse than on the first).
Keyboad feels nice, but has no dedicated PgUp/Dwn, Start/End keys, but I could remap some keys of the numpad to do that, so I could live with that.
The Dell has only minimal screen bleed, overall the better keyboad layout (only half-size cursor keys, though). But I don't think that I can bear that noise under load - it is not only the air moving, there is also some high-pitched whine caused by the fans. In addition, the fan would often spin up for a few seconds seemingly randomly, which I find quite annoying.
I like that it has Thunderbolt, too, while the Lenovo has only USB-C 3.2.
I think I can rather get used to the screen bleed than to the noise, but currently I consider returning both, but I find it hard to find an alternative at the same price point (in particular considering that both were black friday deals).