this is a very loaded question. I would imagine it depends on the institute as well.
Having done both, it’s difficult to compare. CFA is a very specialised finance certification.
The CA is a broad based accounting qualification, the syllabus included Financial Accounting (IFRS), (Corporate) Finance, Auditing, Management (Cost) Accounting and Tax.
Writing the CA exam itself was pretty strenuous, and it is split into 2 sets of exams now. The first exam is done within 3 months of completing your ‘honours’ degree (a post-graduate accounting specialization), the 2nd exam 18 months after that. The first set of exams consists of 2 papers of 5 hours each on consecutive days and the 2nd set consists of 1 paper of 5 hours.
However ask any South African CA and you’ll realize that getting to be able to write your exam is the true challenge. When I started on this path at my university approximately 800 students started in Accounting 101 on the path to becoming a CA (there’s a specific bachelors degree for CAs my university had offered). By the end of my second year there were less than 300 students left. By the time I got to graduate school there were 70 of us left. Of those 70 only 46 completed the post-graduate course. And of the 46 of us who wrote the board exam 42 passed (91% pass rate for my university). So it seems high, but when you consider 42 / 800 only 5% made it to the end.
And it gets worse, some universities have pass rates as low as 18% for the graduate year. This being because all the universities compete to show who has the highest board pass rate, so the average pass rate for the graduate course is way under 50%. Of those who write the board exam the average pass rate is about 60%.
How hard is graduate year? Our final set of exams consisted of 3 papers of 4 hours and one of 5 hours on consecutive days (fortunately we had a weekend between the last one). The level of depth asked in those papers was very extensive.
Compared to board exam, well they only have 10 hours to test you (in part 1) on 4 subjects (accounting, finance, tax, costing) and 5 hours to test auditing in part 2. The difference is its completely integrated. E.g. you likely have to do discuss why an entity should or should not be consolidated, then prepare the fully consolidated financial statements (B/S, I/S, cash flow), and calculate both the deferred tax as well as the tax liability all in the same vignette. Typically corporate finance (WACC , IRR) would be integrated with the costing question (make/buy decision; standard cost etc).
Lastly there are zero multiple choice questions in the CA exam. It is all ‘essay’. There is no prescribed format to produce your financial statements and the vignettes often extend 2 or more pages (first 20 minutes are spent just reading the vignette).