Hi Parchiao
To begin with both cameras are excellent RF with unique merits.
I was introduced to the Bessa R3a by a friend. That’s when I start to get interest in the RF photography. Soon I save enough to purchase a grey R3a. It is a great camera to start with. After 3 years with the Bessa, I decide to look for an upgrade. My choice was a used leica M6 or a new Zeiss Ikon. Like many I could not decide because I was trying to to buy a camera based on specs or comparing what other people think simply isn’t the same.
Some might not agree, but my experience was got down to hold the cameras in your hands feel the ergononomics ,work through the functions, how the camera feels in your hands and eyes that’s where hands-on comparison will help any buyer in their decision-making.
My choice may not be your choice. The important thing is you must feel it for yourself.
Cheers
Alvin
Yes, many a times, I have been asked which Bessa or RF body to get... And I've always advise my customers, get one that meet your needs, if you need AE, get one with AE. If you don't need AE and have been shooting in M mode, get the M. If Bessa is too light for you, get a M6. But do bear in mind the cost of a good condition M6 (condition 8 or 9) is going to cost about $2.2K. If the M6 has been used, then a good CLA is recommended and that will set you back by another ~S$250. Adding up, the body of a M6 will come up to twice (if you are lucky) or more than twice the price of a new Bessa R3A Matt Black. But I have to say, the M6 is a different class. I personally like to shoot with the Leica, but love the R4M for the 21mm framelines and R3M for the 40mm framelines with 40mm/f1.4. For holidays, nothing beats a single lens R3M + 40mm/f1.4 combi.
Comparing the Bessa, Ikon & Leica M is like compaing Honda Civic Type R, BMW M3 & Porsche GT3. All 3 are performance class cars with pretty good engines, but they are different class. Buy what suits one's pocket.
The strength of the Ikon as Terence has said, is the bright viewfinder & long baselength. Which some people said the VF is brighter than the Leica M series. If one compare Bessa R4 with Ikon, R4 beats Ikon in brightness, as it is a 21mm viewfinder, lots of light come in at that kind of lens. That's why it's brighter. If a bright viewfinder affects your phototaking skills, because, you need a bright VF to feel the mood, then GET THE R4!
In the world of classic RF, it's not as difficult as chosing a digital SLR body (so much specs to consider abt). All you need to do is pick up a RF body and if you feel good holding it, feel good looking through it, fits your budget, then u can get the body.