Have anyone been able to get 4K in 60Hz with this product. I am using Samsung U28E590D, Raspberry PI own 1m cable, apply all the right settings (searched internet forums), but so far no success. 4K in 30Hz is ok on all 3 Raspberry 4 I have, but no chance with 60 Hz.

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Answer

Preconditions:
1) You have to use port hdmi0 which is next to power input, not hdmi1 which is next to 3.5mm jack;
2) Enable "hdmi_enable_4kp60=1" by GUI or CLI

It doesn't work at the beginning:
1) Enable the 4kp60 mode by adding "hdmi_enable_4kp60=1" to /boot/config.txt, or do it under CLI by "sudo raspi-config" -> Advanced Options –> (A9) Pi 4 Video Output.
2) Reboot and completely no video output signal to the monitor, seems like pi4 doesn't even boot to the OS...

Then had a little bit more search, to me the issue was due to "dtoverlay=vc4-fkms-v3d" option inside /boot/config.txt, according to below URL, they won't work together:
https://raspberrypi.stackexchange.com/questions/104533/cannot-set-60hz-4k-with-raspi-4b
So:
1) Comment this line "dtoverlay=vc4-fkms-v3d" inside /boot/config.txt
2) Enable the 4kp60 mode by adding "hdmi_enable_4kp60=1" to /boot/config.txt
3) Reboot and enjoy video output at 4kp60.

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Question about Raspberry Pi 4 8GB Model B

Have anyone been able to get 4K in 60Hz with this product. I am using Samsung U28E590D, Raspberry PI own 1m cable, apply all the right settings (searched internet forums), but so far no success. 4K in 30Hz is ok on all 3 Raspberry 4 I have, but no chance with 60 Hz.