Here is the parking light at night. The LED is to the extreme left. (The image is exposed such that the lamps are not overexposed, so that it is possible to judge their relative brightness.)
The next image is with the brakes applied as well. I would say the difference between the inner parking lamps and the outer braking lamps appear more pronounced to the eye than in the photo.
In addition to the standard central brake light (three bulbs currently working, one not), I have added a strip of LEDs for comparison. You can also see their reflection in the trunk lid.
The central LEDs appear significantly brighter than the halogen bulbs when seen straight on, but the LEDs are more directed.