Hasselblad and Phase One are private companies, and have very limited requirements to disclose financial data. They don't release earnings reports, so gauging the financial health and sustainability is all but impossible for anyone outside the board room - this includes employees, industry insiders, reviewers, etc.
But Leica is a public company. From their
interim report:
Leica Camera AG’s third-quarter figures and nine-months results in fiscal year
2010/2011 show the best sales since the Company’s IPO in 1996
...
The increase in sales on the prior year is due to the continuing strong demand registered for
all of the Company’s product categories – sales in the Photo product group more than
doubled with the Leica M system, the professional S system and the digital Leica compact
cameras.
They don't specify how much is coming from the S system, and how much from M and compact cameras - so the above statements again tell absolutely nothing about success and profitability of their MF system. Their EBIT (Earnings Before Interest and Taxes, one measure of profitability) is also increasing very impressively, although they also say their inventories are growing (ie. they are producing more products than they sell).
So most of the claims you hear and read below are speculation, conjecture and inference. Some might have access to members of the board room, but even that doesn't guarantee accurate information, as "business is good" is a standard answer for everyone from a corner liquor store to a CEO of a Fortune 50 company, no matter what the situation actually is.
Look for the financial results for the last few years, and you alone can answer this question. ..
Now I hope that will change, new investor - new opportunities.
Hasselblad and Phase One don't need to disclose their financial results since they are private companies.