No one is a profesional wildlife landscape wedding fashion sports event macro architecture photographer.
lol, true....but some of us out there do try to diversify.
currently i am mostly shooting weddings/events, portraiture, and real estate/architecture. that alone has me looking at a pretty hefty lineup of lenses. i am also very interested in getting into product photography and food photography...add a few more lenses to the lineup.
for me, basic needs are covered by the 24-70mm F2.8 and the 70-200mm F2.8. you can cover alot of jobs with just those two lenses.
getting into architecture made the 24mm TS a necessity and i have found that i will greatly be helped by adding the 17mm TS soon. the 45mm and 90mm may not be too far off if i can expand my shot offerings to larger scale buildings that would require a bit of distance and elevation to capture properly. there, i have quickly justified the whole TS lineup.
as far as the event and weddings go...sure i'm covered with the 24-70mm and 70-200mm but going into my 5th year of doing weddings i'm pining to add a bit more flair to my shots. enter the 35mm F1.4. instant love affair with that lens and i still find the 24-70mm quite useful despite that. i then picked up the 85mm 1.8 to test the usefulness of that focal length at a fast aperture (jury is still out) as a precurser to purchasing the 85mm 1.2. eventually i will replace the piece of junk 50mm 1.8 with the 1.2 version but that is pretty far down the priority list atm. throw in the 15mm Fisheye for the obligatory fun shots.
thinking ahead towards my entry into product, i see the 100mm 2.8 macro as something that will likely be necessary. i also see the 90mm TS pulling double duty here as well.
so considering that i currently do weddings, events, portraiture, and architecture and i am intent on entering the world of product my ideal lens lineup would look like this:
16-35mm F2.8L
24-70mm F2.8L
70-200mm F2.8L
15mm F2.8 Fish
35mm F1.4L
50mm F1.2L
85mm F1.2L
100mm F2.8L Macro IS
17mm F4.0L TS
24mm F3.5L TS
45mm F2.8
90mm F2.8
that lineup would suffice my philosophy of "the right tool for the job".