The last bombing mission of WWII from Guam to the for side of Japan on the night of 13/14 August 1945 the B-29's were reported to have carried 16,000lb bomb loads 5,800 miles (round trip) that is an incredible load/range combo that nothing else could touch in WWII.
Actuly the B-29 was a great leap. In one jump it raised the average payload from around 5,000lbs (the Lanc had an extream payload for early-mid WWII designs) to 20,000, increased range with that payload by 2x to 5,000mi, increasedaltitude to over 30,000ft, airspeed bu 100mi, added pressurisation for crew support and added remote fire control to better control the weponry. Some of these were firsts for Any production plane!
It was so advanced that Stalin made reverse engineering the B-29 a national priority for two years after 3 were interned in 1945.
that's a still taken from a video clip showing russain paratroopers, they had to climb out onto the wing holding onto a rope, then just let go, i think it was because it was too dangerous to just jump out the door
B-29 would ultimately carry a weight (up to 2 Grand Slams) or greater power (Fat Man, Little Boy) than the Lancaster. By war and away the B-29 was the best bomber.
It's technological jumps also included the very complex remote sighting system and pressurization. In terms of performance or technology, nothing else from the war could touch it.