That was my initial headache when I was choosing between 10-24 and 11-16 dude, both got their pros and cons. You can't have your cake and it eat - so you have to consider everything. You say indoor shots are important for you, one question - how often would you go to concerts? 10 times a year or just 1/2/3 times, versus how often would you do landscape shoots? Forever or short term? When you get married and settle down, would you still go to concerts? Would you still go out at night very often? Questions questions.
After much deliberations, I started to know my answers clearly, hence I went for 10-24mm... Why not Nikon 12-24 you say? Well, distortion bothers me, and at 12mm (12-24) the distortion is the worst... whereas for 10-24, 10mm is the worst until you bring it down/up to 12mm or so... Therefore, you can say that 10-24 kinda help cover the distortion problems in 12-24mm... f4? Well, since I already know I don't do indoors that much (in the long term) as compared to outdoors, the answer is pretty obvious for me...
ya.. its kinda of hard to decide.. not just concert.. family gathering, party all these.. I need to use a UWA because of space constrain.. but I haf not been able to test my flash with the lens yet.. so its kinda of bothering me about the effect if I were to start using flash if it was to be shot in door. I shoot normally using the 2nd curtain.. Kit lens outcome was fine for me. But then most of the time space constrain is a bother to me cause my kit lens cannot work in a space constrain space especially like homes where Sengkang those kinda of housing.. its just simply too tight for me to take using kit lens when we have furniture all these..