Hi guys, So, I have both the O45 (long-term travel prime) and the O75 (non-travel/short term travel prime, which I've left in Canada and won't have access to for the next 1.5 years)...but lately I've been looking at the Sigma 60 2.8 and I'm absolutely loving the way it renders. Initially, I dismissed this lens off-hand because I thought f2.8 on our tiny sensors would give very little bokeh...but it's very, very beautiful on the 60 2.8. So...I'm thinking of replacing the O45 as my long-term travel prime. I love how sharp it is, love the way it renders OOF backgrounds, and I like the 60mm focal length. However...that would leave me with only an f2.8 lens as my fastest travel glass. (Others are the 9-18 4-5.6 and the 7.5mm 3.5 FE). I've been travelling fairly extensively for the past few years and I've always had at least an f2 with me.The Sigma is also 50% heavier and somewhat larger (both issues for me, as I backpack for weeks at a time and every gram and cubic centimetre counts! So...here are my options: 1: Forget it. I already have enough great lenses, use them and be happy. 2: It's so cheap...buy it. Even if I don't travel with it, it won't hurt the kit. (But is that pointless?) 3: Replace the O45 with the S60 as my travel prime. Thanks in advance for your input!