Overall, the Switch OLED has the same specifications as a standard Switch, and it is not a 4K-capable Super Switch or Switch Pro. Most notably, the battery remains unchanged, as do the resolutions: 1080P in docked mode and 720P in portable mode.
While the screen on the OLED is larger, the console itself, with the Joy-Con attached, is the same size as a standard Switch: 102 mm x 239 mm x 13.9 mm.
The Nintendo Switch OLED is not a “Switch Pro,” and I doubt anyone should buy it if they already own a standard Switch or, perhaps, a Switch Lite. I believe the OLED is primarily intended to persuade those who have yet to purchase Nintendo’s console to do so.
Can Switch OLED do 4K?
According to Nintendo Prime, the Nintendo Switch OLED cannot output 4K at 60 frames per second. This is due to the fact that it uses the same Tegra X1 chip as the standard Nintendo Switch.
He does, however, mention that the dock could be reused for a Nintendo Switch model that supports DLSS Deep Learning Super Sampling.