I have a pair of Leica Ultravids in 10x42 and have used them side by side and can see no difference in image quality, brightness and colour. I would imagine that Leica have used the same lens in both models, hence they are the top of the line models with the Geovid's being a tad more expensive due to the rangefinder. Zeiss have now bought out a rangefinding bino in their Victory series and I think they have done the same. There is a fair difference in the light gathering capabilities between a 10x50 Swaro and 10x42 Leica, so to compare them on this front is not apples to apples.
As stated above, the top binos have very little difference in optical quality, some say Leica have finer optical performance and have better colour retention, some say Swaro are brighter and some say Zeiss are better overall. Ergonomically in the hand they vary too. In the end it is up to the person forking out the big bucks for a once in a lifetime purchase, which is what all these top of the line binos are. You cannot skimp on quality that will last (hopefully) forever
If I was a rifle hunter (I am a bowhunter) I would have forked out the extra for the Geovids for sure as having the one unit to lug around is a huge advantage and there is plenty of time if you are taking a longer shot with the rifle to steady the binos to get a good range on them. However given the close quarters I need to get into, I use a smaller compact rangefinder, as I need one hand operation and minimal movement when it comes time to range my target. I could use the bino RF but choose not too, though I have friends that do.
While on this point, I do not think that you will find a better rangefinder than the Swarovski Laser Guide 8x30. This unit has an optical quality that has to be seen to be believed. If only it was not a monocular, I think this would be the only optic I would use, bar a spotting scope for long range glassing. The brightness and sharpness are awesome and the rangefinder has a scanning mode that is very handy indeed. It is very easy indeed to locate your target due the larger objective lens, particularly when hunting in low light or in thick and dark bush. Most other rangefinding units have a small objective lens and they simply do not have the capability to gather as much light in these situations.