I have a Super 66 and 66 along with 5 lens, 55 to 250. The 150 and 85 are the 2 lens I use most often, followed by the 55 and last the 250 which I only use on occasion. There is a fisheye and a 120 or it 110 macro and 500 which I don't have so cannot comment on. The 85 2.8 is a fine lens, as good as any MF lens, I've used including Zeiss. If I were to redo my system, I would skip the 250 and get a macro lens instead. Although if you are into birding the 500 could be good buy. The largest issue will be repair of maintenance of the bodies. Although build quality is good, they were last made going on 50 years ago, many saw heavy use by wedding and commercial photographers. Here in the States, there is only repair shop that has parts, the owner was an authorized Kowa repair center, and he kept a large inventory of parts. He is pushing 80. I’m not sure where on your side of the world will work on Kowa. In terms of the complete set of lens the 65 to 250 are common here, the macro and 500 rare, and I have only seen one fisheye. There is a teleconverter, waist level and eye finder and a metered finder along with focusing screens. I have been told of a bellows, might be a myth. My backs for the Super 66 are still light tight. There are 2 66 bodies, the M (?) came later and has mirror lock up. The Super does not have mirror lock up but has much better damping than the 66. I use the standard 66 body the most as it is lighter and I only shoot black and white, so I just do not need the additional backs.