Originally posted by Andi Lo Abacus, I searched a little bit and seems like Fuji and Sony have zero weather sealed lenses, and the m43 as a whole has four (three zooms and one prime). Is there really that many weather sealed lenses? If there are some that I missed, let me know.
Discounting the top dog Nikon and Canon lenses (which are huge) current Pentax seems to have more compact WR lenses than the rest of the industry combined.
We have
DA 1855
DA 18135
DA 1650 (smaller than 24-70 with FF)
DA 55
DFA 100 WR
DA 2040
DA 50200
DA 55300
We also have
DA 50-135 (equal to having 70-200/4 on FF or the oly 35-100, both are bigger lenses)
DA 60-250 (same size as 70-200/4 but more range)
Just missing an UWA and two more primes imo... DA Lim HD is really a missed opportunity to put in WR (not that they need it anyway I guess, I use DA 40 in the rain all the time)
The 4 new Sony Zeiss lenses are WR I believe - the ones that were intended to pair with the A7/A7R.
For Canon current WR lenses (Based on DW-R tag or Canon description):
EF 16-35/2.8L II USM
EF 17-40/4L USM
EF 24-70/2.8L II USM
EF 24-70/4L USM
EF 24-105/4L IS USM
EF 70-200/4L IS USM
EF 70-200/2.8L IS II USM
EF 70-300/4-5.6L IS USM
EF 200-400/4L IS USM 1.4x Ext
EF 14/2.8L II USM
EF 24/1.4L II USM
EF 50/1.2L USM
EF 200/2L IS USM
EF 300/2.8L IS II USM
EF 400/2.8L IS II USM
EF 400/4 DO IS USM
EF 500/4L IS II USM
EF 600/4L IS II USM
EF 800/5.6L IS USM
Teleconverter 1.4X
Teleconverter 2.0X
19 lenses, 2 tcs
*some lenses will require a front filter for sealing
For Nikon (this is off internet trawling):
Nikkor AF-S 14-24 F2.8 ED
Nikkor AF-S 24-70mm F/2.8 IF-ED
Nikkor AF-S 24-85 F3.5-4.5 VR
Nikkor AF-S 24-120 F/4G ED VR
Nikkor AF-S 28-300mm F/3.5-5.6 ED VR
Nikkor AF-S 50 F1.8G
Nikkor AF-S 70-200mm F/2.8G IF-ED VR
Nikkor AF-S 85mm F/1.4G
Nikkor AF-S 105 F2.8G Micro
Nikkor AF-S 200mm F/2G ED VR II
Nikkor AF-S 200-400mm F/4G ED VR II
Nikkor AF-S 300mm F/2.8G ED-IF VR II
Nikkor AF-S 400mm F/2.8G ED VR
Nikkor AF-S 500mm F/4G ED VR II
Nikkor AF-S 600mm F/4G ED VR
Nikkor PC-E 45mm F/2.8D ED Micro
Nikkor PC-E 85mm F/2.8D Micro
16 lenses
Nikon won't say which lenses are WR, so it's a bit of guesswork based on user experiences. Plus I cannot be sure which is fully sealed, and which just has a gasket.
By comparison - and to expand on your list:
Pentax:
DA* 16-50 F2.8
DA 18-55 F3.5-5.6 WR
DA 18-135 F3.5-5.6 WR
DA 50-200 F4-5.6 WR
DA* 55 F1.4
HD 55-300 F4-5.8 WR
DA* 50-135 F2.8
DA* 60-250 F4
DFA 100 F2.8 WR
DA* 200 F2.8
DA* 300 F4
HD 560 F5.6 AW
And soon, HD 20-40 F2.8-4 WR Ltd
13 lenses
As far as wide to telephoto, we're pretty even with Nikon and Canon. Canon has some nice WR primes - but how WR? I don't know. What we do lack is the 400mm, 500mm, and 800mm to be completely equal.