Did you read the OP's list of cameras?
"D50, D40, Rebel XSI, Rebel T3, D70, Lumix G1, Lumix G2, D5000, LX-5, DRebel, D1H, FZ30"
I don't know the capabilities of all these cameras, but I'm sure a handful of them are capable of getting the shots he posted as examples. So he does not need to change the tool.
At this point, we're all speculating what the problem is since the OP hasn't posted his own images. If he did, I agree with the shimokita and ChrisP that it would help pinpoint the problems.
well you know, here is what he said:
I can't seem to make good, sharp photos come out of mine.
I've tried about 12 different cameras over the last 5 years and all were mostly disappointing for one reason or another and try as I might with Lightroom and Picasa I can't get them to do what I want. My frustration is at an all time high and I'm feel like never using a camera again. My latest experiment is m4/3rd with a G2 but even at ISO 400 there seems to be a ton of noise and this sensor seems to have about half the dynamic range of slide film.
I'm not an idiot, I know how to take picture, I've been doing it for years. I know have a nice Mac, software, and an Epson R2880 so I have to tools to produce great prints. I've bought prints from Lenswork and they use the same paper and same ink set (in a larger format printer) and I LOVE what I see but I can't seem to get my equipment to do this
so let's see:
1. he cant get sharp pictures
well you know, someone who has been taking pictures for more than a month on a dSLR probably can get what the average person would call sharp just by shooting at f8 in the middle of the day.
but when you look closely, you are likely to be exceptionally disappointed. when I looked at my dSLR camera's output for the first time in PS I thought it wasnt sharp either. because honestly, it's not. which camera that he posted is noted for it's pixel level sharpness, exactly?
2. he thinks the dynamic range is not good enough on m4/3
like I said, you cant magically make more DR appear. he is losing shots because his highlights are blown or his shadows are blocked that in the past he didnt have trouble getting on slide film.
3. other prints look fine, his dont.
well that's probably post processing.
he came here to ask for advice in how to improve the technical quality of his images and most people responded by telling him he sucks at making pictures and he should ignore image quality and focus on making his pictures more "interesting". to me, that qualifies someone as a dick.
the guy may take pictures of his cats all day. I do. doesnt mean I am asking an invalid question if I want my cats to be drawn at 200 lp/mm. OP wants his pictures to look good beyond the subject matter; how is this not ok? I know some people buy a Summilux ASPH to shoot on expired neopan 1600 but subjecting yourself to poor IQ for any other reason than because you like it is not benefiting yourself, it's being emo.
and then you accuse me of not reading the post. right. I see. It is with some irony that I observe that nearly every time I point out someone completely missed the point of the OP that someone has to question whether or not I actually read it. I can assure you that I read it, afterall I have nothing better to do as I have no life.
now, to the OP:
if you want results that are sharp at 100% on a digital camera I don't know what to tell you. The current generation of full frame cameras are quite good and the newest generation of smaller sensor cameras that is slowly making its way out looks like a major improvement too (OM-D, fuji x-pro 1, etc).
but you could just shoot medium format slide and scan it. but in the end that takes post processing effort just like digital does. although I have to say that I do quite like Raw Therapee's presets.