I bought a Canon 20D back when 8 MP was "the new standard" over the prior generation's 6MP I had in my Fuji S2 Pro. The 20D was my "Canon trial" camera. I got it with a Sigma 18-125 DC lens for walkabout use, and a 100mm f/2.8 EF macro that I got used for $240 as I recall. I then picked up a 50mm f/1.8 EF-II lens. I the next lens I got was soon after, when I bought a 70-200/2.8 L-IS USM. it might be hard to imagine today, but the 2003-2004 era was pretty far behind where we are today; the quality of the images from a $699 low-end Nikon or Canon or Sony are far above those of even a professional camera of that era, and MUCH of the software we take for granted today was in its infancy back then.
At that time, Nikon's D100 was a so-so camera...Nikon's D1h was at 4.2 MP, and had simple but decent five-area autofocus...Fuji's S2 Pro had beautiful color! BUT--it needed 4-AA batteries AND two, 123A lithium batteries in order to get say 300 shots on one load of AA rechargeables. Without the two 123A batteries, the Fuji S2 Pro would chew through the 4 AA's in as few as 45 frames!!! One set of batteries ran one side of the camera, the other set ran the other side--normally. But, withiout the lithiums in the handgrip, the AA's in the battery tray underneath the grip were forced to carry the whole load, and without those two 123A's ($6.99 each then at walk-in retail!!! and NO rechargeable 123A at that time!) the Fuji S2 pro, while the best camera for a Nikon user in terms of color and pleasing images, was a real PITA in terms of battery switching,charging, and hassles. When it hit the market, the Canon 20D was **the** hot, new wedding and generalist camera. At least as far as I was concerned.
I later got a 5D classic kit with the 24-105 f/4 L IS USM as an all-arounder, and added the 580 EX-II flash, the 50/1.4, 85/1.8,135/2,135 2.8 Soft Focus, and in 2006, that and the 70-200 2.8 made up a pretty hot chit Canon setup!!! The 5D and 50 and the grip is the camera seen in my avatar selfie to the left<<<<. At the time, Nikon had NO full-frame option, and the 5D Classic was, at the time, one of the best imagers on the market. The 5D still compares favorably with the Nikon D3 and D700 bodies in terms of image quality. I bought the 5D because I REALLLLLLLY wanted to see what a full-frame camera was like, and I wanted to see if I could make a clean break from Nikon and to Canon. At that time, Nikon (and me!!!) was still "stuck" with the D2x...which was, in many was, a freaking fiasco...a $5,000 fiasco.