i've used the 24-70mm extensively. i have a love-hate relationship with this lens.
i dont really have any interest with other lenses to be honest. the 15-30 is a touch too big, and too expensive. for something that large, not being able to place reasonable filters kind of defeats the purpose of that lens. plus, my 14mm 2.8 keeps me covered around that range.
the 70-200 i'm sure is a great lens. however, i have a tammy in the same range, and its a little lighter, so it does the job for me. i'm sure the pentax is better as its newer and modern tech. but the weight kind of kills it for me.
i would love to travel with the 70-200 as i'm always using it at 200mm for portraits and the results are always magic. but the weight and heft just kills it for me.
the issue i have with the 24-70 is its weight and size. traveling with that is a pain. but the images i get back from it are great. so i'm not sure how i feel about it.
i was looking into selling the 24-70 and getting the 28-105 to use as traveling. but seeing as how i just got a new job that will prevent me from taking 2-3 months off to travel...i may hold onto the 24-70 for the time being. i could sell the 70-200 tamron and get a pentax da200 2.8 as it is smaller, lighter, WR, and i can easily travel with that.
once i travel, i'll prolly just carry the 28-105 with me, and prime my self with everything else.
and the weight is so heavy that my go-to bagpack, the lowepro 450 is starting to rip. breaks my heart as i love that bag. but now i get to explore other options
the car i drive is a Mini Cooper... i may make a video on it soon. looking into getting into video and need a subject to shoot